44- LINUX PROBLEM AND SOLUTION

1- Ubuntu 12.04 can't restart

Issue

Ubuntu 12.04 can't restart following the standard reboot procedure:

Click system button in upper right corner > Shut down... > Restart button

It ends up in a black screen.

Solution

The reason for the problem could be a BIOS issue or the hardware setup of the system

1) Enter the command in the terminal

sudo gedit /etc/default/grub

2) Find GRUB_CMDLINE_LINUX="" and change it to GRUB_CMDLINE_LINUX=”reboot=efi”

3) Save the file and run the command:

sudo update-grub

If this is not working, try with some other parameter instead of efi (i.e.: reboot=efi). For detailed list of available parameters read...

Ubuntu Netbook Restart Problem

Many Linux users that have netbooks have been complaining about restart issue. I didn't pay attention to the complaints until I bought Acer Aspire One D257 netbook

Namely, the netbook running Ubuntu 11.10 and Ubuntu 12.04 failed to reboot, it ended up in a black screen and can only shutdown. What was very strange the issue existed only on regular restart procedure: System button in upper right corner > Shut down... > Restart button. If restart was peformed after system udpate it could reboot properly.

The reason for the problem could be a BIOS issue or the hardware setup of the system. For example some netbooks with Atom processor doesn't come with a keyboard controller in which case Linux kernel can't figure out the way to tackle that situation.

If you have simillar problem with your netbook failing to reboot, here is the way to solve it:

1) Open terminal

2) Type:

sudo gedit /etc/default/grub

3) Find GRUB_CMDLINE_LINUX="" and change it to GRUB_CMDLINE_LINUX=”reboot=efi”

4) Save changes and close gedit

5) Update the grub with the following command:

sudo update-grub

6) Power off your machine and then switch it on again. Once it is booted, try to restart it to see whether it is working. If this is not working, try following commands instead of efi (i.e.: reboot=efi).

warm = Don’t set the cold reboot flagcold = Set the cold reboot flagbios = Reboot by jumping through the BIOS (only for X86_32)smp = Reboot by executing reset on BSP or other CPU (only for X86_32)triple = Force a triple fault (init)kbd = Use the keyboard controller. cold reset (default)acpi = Use the RESET_REG in the FADTefi = Use efi reset_system runtime servicepci = Use the so-called “PCI reset register”, CF9force = Avoid anything that could hang.

Depending on netbook's manufacturer and model, bios, acpi, pci, efi seems to be probable solutions.

Here are some solutions for a couple of netbook models:

Acer Aspire One D257 netbook - efi will fix the issue
Acer Aspire One Happy 2 netbook - acpi will fix the issue

2-There is no "Show Desktop" option

Issue

By default, Ubuntu 12.04 doesn't have enabled options to show desktop except using shortcut keysCtrl+Super+D(the Super button is the Windows button in the most cases)

Solution

Show Desktop in Ubuntu 12.04 via CompizConfig Settings Manager (the first way)

1) Install and run CompizConfig Settings Manager

2) Click on Desktop category on left sidebar > Click on Ubuntu Unity Plugin > Select theExperimental tab

3) Mark option Show "Desktop Icon" in the launcher

The desktop icon will appear in the Unity launcher and you can click on it in order to show desktop.

3-Unity launcher auto hide problem

Issue

Many users compain that after enabling Unity Launcher auto hide, it doesn't show when cursor is moved to the left edge of the screen in Ubuntu 12.04.

Solution

The trick here is not how hard the mouse cursor is moved to the left screen edge but how far (or fast). Here are the steps that could help you in using the launcher in the way you like:

1) Install CompizConfig Settings Manager (known by its shortname CCSM)

2) After the installation, start CompizConfig Settings Manager

3) Go to Desktop > Ubuntu Unity Plugin > Experimental tab

4) Find the option "Launcher Reveal Pressure"

5) Default value is 20, but you can change it to any lower

4-Hibernate option missing

Issue

Ubuntu 12.04 doesn't have enabled hibernate feature by default, but you can enable it if your hardware.

Solution

1) Create file

/etc/polkit-1/localauthority/50-local.d/com.ubuntu.desktop.pkla

2) Add the content:

[Re-enable hibernate by default]

Identity=unix-user:*

Action=org.freedesktop.upower.hibernate

ResultActive=yes

3) Save the file, restart the machine and new menu item should appear under the system button in upper right corner

5-"Ubuntu 12.04 has experienced an internal error" message

Issue

Ubuntu 12.04 contains error reporting system named Apport that can send error information to Ubuntu center in case that something goes wrong on your system. There could be many reported issues caused with various reasons displaying the message error:

"Sorry, Ubuntu 12.04 has experienced an internal error"

Solution

The only solution to stop displaying error messages is to disable the Apport, the error reporting system:

1) Run the command

sudo gedit /etc/default/apport

2) Change the value of the "enabled" parameter from "1" to "0" and save the changes

6-Unity Launcher Hiding Behind Other Windows

Issue

In some cases, Unity Launcher goes in the background, behind all windows and the Unity Shell, and it's not possible to move it to the frontend, in front all other windows (what is its default and normal behavior). This happens no matter whether you enabled Unity Launcher auto hide option or not. Usualy, GIMP causes this annoying Unity Launcher's behavior.

Solution

Sometime, after some further use and without any additional actions, the computer could freeze for a brief moment and Unity Launcher and Dash could continue to work properly. If this doesn't happen here is the way to restart unity launcher without destroying the session and avoiding computer restarting:

1) Start terminal and run the following command:

sudo unity&disown

Screen will flick a few times and after that everything will be back again.

7-Can't change Ubuntu 12.04 default font

Issue

There is no configuration option for changing default font type and size in Ubuntu 12.04

Solution

1) Instal gnome tweak tool:

sudo apt-get install gnome-tweak-tool

2) Start gnome tweak tool either by click on Dash Home and entering "advanced settings" or typing command "gnome-tweak-tool" in the terminal

3) GNOME Tweak Tool window will appear

4) Select the Fonts section on the left

5) Choose your preferent default font, document, monospace and window title font as well as font size and hinting and antialiasing types.

8-Wireless connection doesn't remember password

Issue

Wireless connecton continue asking for password in window "Wireless Connection Authentication Required" every time the computer is started.

Solution

1) Click on the connection icon on the taskbar

2) Select the last menu item "Edit Connections..." > Click on the Wireless tab

3) Select you connection and click the Edit button

4) Check "Connect automatically" checkbox on new window and click "Wireless Security" tab

5) Select the connection's Security (usually it is "WEP 40/128-bit Key (Hex or ASCII)")

6) Enter your password in the Key field (you can check the "Show key" checkbox if you want to see what password you entered) and click "Save..." button

9-GEdit is too slow

Issue

GEdit text editor is very slow in Ubuntu 12.04 Precise Pangolin

Solution

The solution is to disable File Browser plugin in GEdit.

Start GEdit and select Edit > Preferences > Choose Plugins tab > Deselect File Browser Panel plugin

10-Ubuntu 12.04 with low RAM is very slow

Issue

Ubuntu 12.04 Precise Pangolin could become sluggish and slow on a machine with low memory. In this case Ubuntu accesses the hard disk often and it will impact the performance very much.

Solution

Change swappines value. The lower the value is, the longer it takes before Ubuntu starts using the swap partition instead phisical memory. More about Linux swappiness read HERE.

1) Run terminal

2) Enter the command to check out current swappines value

cat /proc/sys/vm/swappiness

3) The result will probably be 60 (default value in Ubuntu for swappiness)

4) Open file /etc/sysctl.conf in a text editor, e.g.

gedit /etc/sysctl.conf

5) Go to the end of the file and enter the following parameter

# Decrease swappiness value
vm.swappiness=10

6) Save the file and restart the computer

11-"Hot Corner" show desktop doesn't work after restart

Issue

Our article describes how to show desktop in Ubuntu 12.04 by enabling "hot corner" feature, but in some cases the feature will not take effect after a computer is restarted.

Solution

It seems that unityshell plugin is rewritting the expo plugin configuration. Configure the expo plugin to be loaded after unityshell:

1) Start gconf-editor and find /apps/compiz-1/general/screen0/options/active_plugins key

2) Double-click on the key active_plugins will display edit window

3) Place expo under unityshell and click OK to save the changes

12-Ctrl+Alt+Backspace doesn't work

Issue

Ctrl+Alt+Backspace doesn't restart/kill X server and session.

Solution

This feature needs to be enabled:

System Settings... > Keyboard Layout > Options... > Key Sequence to kill X Server > Select option Ctrl+Alt+Backspace

13-Touchpad stop working

Issue

Touch-pad can randomly stop working sometimes on laptops/net books/notebooks.

Solution

Disable touch-pad and re-enable it again using shortcut Fn + F7.

14-Ubuntu Netbook Restart Problem

Many Linux users that have netbooks have been complaining about restart issue. I didn't pay attention to the complaints until I bought Acer Aspire One D257 netbook

If you have simillar problem with your netbook failing to reboot, here is the way to solve it:

1) Open terminal

2) Type:

sudo gedit /etc/default/grub

3) Find GRUB_CMDLINE_LINUX="" and change it to GRUB_CMDLINE_LINUX=”reboot=efi”

4) Save changes and close gedit

5) Update the grub with the following command:

sudo update-grub

Depending on netbook's manufacturer and model, bios, acpi, pci, efi seems to be probable solutions.

Here are some solutions for a couple of netbook models:

Acer Aspire One D257 netbook - efi will fix the issue
Acer Aspire One Happy 2 netbook - acpi will fix the issue
Dell latitude E6420 - pci will fix the issue

15-How to migrate Thunderbird profile

We at INFORBIRO - information technology agency as Free Software advocates use Thunderbird as our mail client. It is very robust, has great capabilities, supports many different email accounts and it's easy to migrate between different environments!

Our developers, designers and consultants often need to use more than one computer (desktops, laptops, netbooks...) and it is a priority for them to have mail access from all machines. So I am sure that the instructions will be very useful to you as well.

In short, migration a Thunderbird profle is a copying of the profile folder from one environment to another and editing profiles.ini file.

For example, here are steps for migrating a Mozilla Thunderbird profile from Windows 7 to Ubuntu 11.10:

1) Thunderbird is already default mail client in Ubuntu 11.10 so you do not need to install it manually

2) Close Thunderbirds if they are started on both environment

3) In Ubuntu go to a thunderbird profile folder, e.g.\home\%user_name%\.thunderbird\etw22loq.default (replace %user name% with your user name)

If you can't see .thunderbird folder it means that is hidden, so press Ctrl+H to show all files and folders.

4) Delete all files from profile folder (make a backup of the folder first!)

5) Open profiles.ini file in a text editor

6) Check if there is a line with your profile folder name, e.g. Path=etw22loq.default. If it contains other path replace it with a valid one.

Example of profiles.ini in GNOME on Ubuntu environment:

[General]
StartWithLastProfile=1

[Profile0]
Name=default
IsRelative=1
Path=etw22loq.default
Default=1

7) Go to a profile folder in Windows 7, e.g. %drive%:\Users\%user name%\AppData\Roaming\Thunderbird\Profiles\hje43myq.default (replace %drive% with a proper drive letter and %user name% with your user name)

If you can't see AppData folder that means it is hidden. To show hidden files and folders in Windows Explorer: Organize > Folder and search options > View > Show hidden files, folders and drives

8) Copy all files from the Windows 7 profile folder into the profile folder in Ubuntu

9) Start Thunderbird and you should be able to see all migrated email accounts from Windows 7 on Ubuntu.

Note:

If you need to migrate an Thunderbird profile from Linux to Windows consider that on Windows 7 fileprofiles.ini is located in %drive%:\Users\%user name%\AppData\Roaming\Thunderbird\ (not in folder containing profiles folders!). In most GNU/Linux GNOME environment it is in the same folder as profiles are.

Happy emailing!

16-"Ubuntu 12.04 has experienced an internal error" message

Ubuntu 12.04 contains error reporting system named Apport that can send error information to Ubuntu center in case that something goes wrong on your system. Debugging program crashes without any automated tools has been pretty time consuming and hard for both developers and users, so that is the main reason why this system exists.

There are many reported issues caused with various reasons displaying the message error:

Sorry, Ubuntu 12.04 has experienced an internal error

If you experience something simillar you can click on "Show Details..." button to see what data it collected. On my system (Acer Aspire One D257 Netbook) this is the issue that used to appear very often:

Sorry Ubuntu 12.04 has experienced an internal error.
If you notice further problems, try restarting the computer.
...
ExecutablePath
/usr/lib/unity-lens/music/unity-music-daemon
Package
unit-lens-music 5.10.0-0ubuntu1
ProblemType
Crash
Title
Unity-music-daemon crashed with SIGSEGV in g_bit_lock()
ApportVersion
2.0.1-0ubuntu7
Architecture
...

17-How to disable Apport error-reporting system in Ubuntu

However, you can disable the error-reporting system following the steps:

1) Run the command

sudo gedit /etc/default/apport

2) Change the value of the "enabled" parameter from "1" to "0"

3) Save changes

18-Ubuntu 12.04 - Unity Launcher Hiding Behind Other Windows

Unity Launcher is an application switcher and launcher in Ubuntu Unity.

In some cases, it goes in the background, behind all windows and the Unity Shell, and it's not possible to move it to the frontend, in front all other windows (what is its default and normal behaviour). This happens no matter whether you enabled Unity Launcher auto hide option or not.

I noticed that in the most cases GIMP causes this annoying Unity Launcher's behavior. After some further use, the computer could freeze for a brief moment and Unity Launcher and Dash could continue to work properly in front of windows and dash.

After rebooting, the issue dissapears until the next time (there is no rule for this bug)

19-How to bring Unity Launcher back to front without

restarting the computer and destroying the session

Here are the steps how to restart unity launcher without destroying the session and avoiding restarting

1) Start terminal

2) Enter the following command:

sudo unity&disown

3) Hit Enter button

Screen will flick a few times and after that everything will be back again.

Consider that the above steps is not the real bug's solution but rather a way to temporarily fix its outcome.

20-Ubuntu 12.04 - How to Change Default Font

Unity, a default desktop shell in newer Ubuntu releases doesn't have an option for changing default font type and size as Ubuntu had in the previous versions.

Somehow, I think that default font size in Ubuntu 12.04 Precise Pangolin is too big for modern screen resolutions. Here are instructions how to change default font size in Ubuntu:

1) Instal gnome tweak tool with the command:

sudo apt-get install gnome-tweak-tool

2) Start gnome tweak tool either by click on Dash Home and entering "advanced settings" or typing command "gnome-tweak-tool" in the terminal

3) GNOME Tweak Tool window will appear4) Select the Fonts section on the left5) Choose your preferent default font, document, monospace and window title font as well as font size and hinting and antialiasing types.

21-Ubuntu 12.04 - Wireless Password Remember

Default behaviour in Ubuntu 12.04 fir wireless conectivity is to ask a user for a password every time the system is started displaying message "Wireless Connection Authentication Required". Also, if you have a weak wireless signal it could happen that Ubuntu has problems to connect and continue asking for password.

Here is the tutorial how to force Ubuntu to remember wireless connection password and to connect automatically without asking you every time.

1) Click on the connection icon on the taskbar

2) Select the last menu item "Edit Connections..."

3) Click on the Wireless tab

4) Select you connection and click the Edit button

5) New window will appear

6) Check "Connect automatically" checkbox

7) Click "Wireless Security" tab

8) Select the connection's Security (usually it is "WEP 40/128-bit Key (Hex or ASCII)")

9) Enter your password in the Key field. You can check the "Show key" checkbox if you want to see what password you entered

10) Click "Save..." button

22-Ubuntu 12.04 - How to Enable Hibernate

Ubuntu 12.04 doesn't have enabled hibernate feature by default, but you can enable it if your hardware has support for hibernation.

Before you turn on the hibernate option in Ubuntu 12.04 Precise Pangolin you need to be sure that you machine supports hibernate without any issues. Please consider that hibernate feature on unsupported devices could make a lot of problems even losing your data. You're warned!

23-How to check if computer supports hibernate in Ubuntu 12.04

To be sure that your computer can hibernate open the terminal and enter the command:

sudo pm-hibernate

Enter your password when prompted.

After you computer turns off, switch it back on. If all windows appear as they were before restarting and the system continues to work you can consider enabling hibernate.

In case that hibernate doesn't work properly be sure that swap partition is at least as large as available RAM.

24-How to enable hibernate in Ubuntu 12.04 Precise Pangolin

1) Create file

/etc/polkit-1/localauthority/50-local.d/com.ubuntu.desktop.pkla

2) Add the following content

[Re-enable hibernate by default]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes

3) Save the file

4) Restart machine

5) You should see new menu item that will allow Ubuntu hibernation

25-Ubuntu 12.04 - "Hot Corner" Stop Working

We wrote how to show desktop in Ubuntu 12.04 by enabling "hot corner" feature.

In some cases this setting will not take effect after a computer is restarted. It seems that unityshell plugin is rewritting the expo plugin configuratin so this could cause the issue.

You could work around the issue by setting expo plugin to be loaded after unityshell:

1) Start gconf-editor

2) Find /apps/compiz-1/general/screen0/options/active_plugins key

3) Double-click on the key active_plugins will display edit window

4) Place expo under unityshell

26-Ubuntu - Delete Apt Cache

Ubuntu is based on Debian GNU/Linux distribution, thus it uses Apt package manager.

Default behavior is to keep downloaded software packages on the file system during installation process. During time the packages can use a lot of disk space and we suggest occasionall cache cleaning.

How to clear Apt cache

1) Run file manager (e.g. Nautilus) as root user

2) Navitage to /var/cache/apt/archives

3) Delete all .deb installation package files

Note: Be sure not to delete folder partial and file lock.

27-Ubuntu 12.04 - Frozen Touchpad

Ubuntu 12.04 is the latest and long term support (LTS) Ubuntu release.

It works really great (although with some issues), and I use it for business purpose as well as on home laptop/netbook. Occasionally, I experience a problem with touchpad on my netbook. Namelly, touchpad stops responding and mouse cursor can't be moved on screen.

I'm not sure what causes the issue with touchpad freezing, but the solution that works in my case is very simple - disable and re-enable touchpad support.

1) Press Fn (function key) + F7 in order to disable frozen touchpad

Information that the touchpad is disabled will be displayed.

2) Press again Fn (function key) + F7 to re-enable the touchpad

Now you should be able to use the touchpad without any issue. If the touchpad freez again, replay mentioned steps.

28-Ubuntu 12.04 - Change Mouse Cursor Size

Some readers of our knowledgebase (we prefer this term over blog), complained about mouse pointer size in Ubuntu 12.04 Precise Pangolin.

It seems that in some cases the size of the pointer is quite a bit larger than it should be (about twice as large as "normal" size), although the different cursors (editing text, hyperlink hand, etc) has correct size. The size changes to the correct size when the pointer is over some application windows (Netbeans, Firefox), but then changes back once it is moved out of the window.

If you experience this issue, you could update the cursor theme ans size to resolve the problem. There are a couple of ways to do this.

First method to change pointer size in Ubuntu

1) Open terminal

2) Enter the following command

sudo update-alternatives --config x-cursor-theme

3) Choose the number of the theme you want (for example, 0 for DMZ-White)

Note: After you change the value, you need to reboot computer (logout and login will not work)

Second method to change Ubuntu cursor size

Also, you can change the cursor's size with dconf-editor.

1) If dconf-editor is not installed on your machine, install it with:

sudo apt-get install dconf-tools

2) Go to org.gnome.desktop.interface

3) Change the cursor size to 24 and cursor theme to DMZ-White

After these changes mouse pointer size should be with proper size in Ubuntu 12.04.

29-Ubuntu 12.04 - Update Could Not Get Lock Error

I experienced the problem with my Ubuntu 12.04 installation a couple of days ago related to the updating process. The error message was:

Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)

If you have the same problem here are the steps that could solve the issue

Method 1

Restart the system and try again

Method 2

If restarting doesn't help, try refreshing package source list

Method 3

Run the following commands

sudo rm /var/lib/apt/lists/* -vf

sudo apt-get update

Method 4

Try with the following command

sudo apt-get update && sudo apt-get upgrade

Method 5

If neither of the steps mentioned above don't work, check if the update process is already running, kill it and try again

30-Problems with LibreOffice icons in Ubuntu 12.04

There are several issues with LibreOffice icons in Ubuntu 12.04:

icons are not displayed at all
icons are duplicated
white square is displayed instead real icons and it is not responsive
a grey empty area are displayed instead the icon
LibreOffice programs are not listed in opened applications and they are not visible even if you use Alt + Tab

So, when you run, for example the Calc, the icon is sometimes the icon is present in the launcher, but there is an empty space on the launcher just above the Calc icon or icon is invisible. This bug is a cosmetical one however in a LTS distribution this does not look professional

Users that use KDE can experience the issue icons not showing in the Office menu.

Possible solution(s)

The only solution we found in GNOME is to lock the icons to the launcher. After that number of the issue will be lower, but they could still appear.

If you cannot see running LibreOffice application even with Alt + Tab, you can use a workaround - Super key + W will show all open windows. Super key is usually the Windows button.

Currently, problem in KDE environment can be solved by using the LibreOffice ppa-repository:

# sudo add-apt-repository ppa:libreoffice/ppa

# sudo apt-get update

# sudo apt-get upgrade

31- Clear and Disable Bash History

Descended from the Bourne Shell, Bash is a GNU product, the "Bourne Again SHell." It's the standard command line interface on most Linux machines. It excels at interactivity, supporting command line editing, completion, and recall.

Bash stores commands entered on the command line and provide access to those stored commands so that they can be used again with relative ease.

That is Bash's history/recall function in a nutshell. You just press the up arrow to scroll back through your command history. See the command you want and press Enter/Return to execute it again.

However, maybe you want to change this behavior and disable Bash history.

How to clear and disable Bash history

Use the following Bash builtin history command:

history -c

In order to stop the writing of your Bash history to a file when you log out, run the command:

unset HISTFILE

32-How to Fix an Ubuntu Error:(initramfs)

First Solution:-

1. Boot from the Ubuntu Live CD;

2. Open/Run Terminal;

3. Type: sudo fdisk -l (to get the device name) then press ENTER;

Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: **********

Device Boot Start End Blocks Id System
/dev/sda1 * 1 30238 242886703+ 83 Linux
/dev/sda2 30239 30401 1309297+ 5 Extended
/dev/sda5 30239 30401 1309266 82 Linux swap / Solaris

The device name for my friend’s system based on the above: /dev/sda1

4. Type: sudo fsck /dev/sda1 then press ENTER;

5. Restart the system and boot normally.

* The laptop booted normally after the fix.

or..

Second Best Solution...

1. Boot from the Ubuntu Live CD;

2. Open/Run Terminal;

# fdisk -l | grep Linux | grep -Ev 'swap'

# dumpe2fs /dev/sda2 | grep superblock

# fsck -b 32768 /dev/sda2

33-Keyboard / Mouse and Browser Problem Solution...

>>>>Ubuntu 12.04LTS stuck at login mouse and keyboard not responding-

Ans- This is a x11 problem.Switch to a virtual console (Alt+F2) and login as your normal user. Now delete the .config .gconf and .compiz-1 folders from your home directory.

$rm -rvf . .config/ .gconf/ .compiz-1/

$sudo apt-get update

Then System Reboot and check..

>>>>Mozilla problem--

Ans- Switch to a virtual console (Alt+F2) and login as your normal user. Now delete the..

$rm -rvf .mozilla/firefox/*

then..

$sudo apt-get update

check..

>>>>Google chrome problem--
Ans- Switch to a virtual console (Alt+F2) and login as your normal user. Now delete the..

$rm -rvf .config/google-chrome/*

$sudo apt-get update

check..

Enjoy.....

34. Ubuntu 13.04 or 12.04 – How To Get Rid Of “System Program Problem Detected” error

After booting ubuntu one gets the following error:

If you report the problem nothing happens and it dosen’t really show the cause of the error
The error keeps on popping up again and again. It is irritating.
To stop the error from popping up follow these steps:
[Note:These steps don't actually solve the problem but just stop the error from popping up!]
1.Open a terminal
2. Enter the following code





1


gedit /etc/default/apport






3.In the file





Change the enabled from 1 to 0.


4.This will stop the error from pooping up.


Enjoy!

35. Turn Off Error Reporting in Ubuntu 12.04 (Precise Pangolin)

Once in a while if something goes wrong in Ubuntu, you usually get the error screen that reads ‘Sorry, Ubuntu 12.04 has experienced an internal error’.
This feature is added to Ubuntu by default and is there to help Ubuntu gather information about issues and create a fix for them. It’s recommended that you don’t disable it as it helps Ubuntu develop better software.
Even though you’re advised not to turn it off, that option is there when you need it. This brief tutorial is going to show you how to disable the error reporting feature of Ubuntu when you need to.
Objectives:

Disable the error reporting feature in Ubuntu
Enjoy!

To get started, press Ctrl – Alt – T on your keyboard to open the terminal. When it opens, run the commands below to

sudo gedit /etc/default/apport

Finally, change the value to 0 to disable it. 1 to Enable it if it’s disabled and save the file.

error-reporting-ubuntu_1

Enjoy!

Please share if you like it on:

35.How to Disable Apport Error Reporting in Ubuntu

After installed Ubuntu system, you may get a large amount of internet error pops up. This simple tutorial will show you how to disable the Apport Error Reporting in Ubuntu.

First launch a terminal window from the dash home (or Ctrl+Alt+T).

Paste following command into terminal and hit enter to edit /etc/default/apport file:

gksu gedit /etc/default/apport

Set enable=1 to enable=0 to disable error apport.

That’s it!

36. How to fix error "The system is running in low-graphics mode" ?

Few days back I faced this error while installing other desktop environment on my PC. The error was "The system is running in low-graphics mode"
So now I decided to share this tip with you guys, If you face any problem in your Ubuntu or Linux Mint or Ubuntu based Distro. This is common bug of Lightdm.

First enter this commands:

sudo apt-get install --reinstall unity-greeter
sudo dpkg-reconfigure lightdm

Then enter this command to open Lightdm text file:

sudo nano /etc/lightdm/lightdm.conf

Now change this line (greeter-session=.........) to following line:

greeter-session=unity-greeter
or 
greeter-session=ubuntu

37. Fix the Package System is Broken error in Ubuntu 10.04/10.10 Maverick Meerkat

This brief tutorial will show you how to fix ‘The package system is broken’ error in Ubuntu Lucid or Maverick. Sometimes when you’re installing programs in Ubuntu and all dependencies are not installed, your package system would get corrupted and you won’t be able install new programs or packages. This will help you fix that.

Getting started:

Below is the image of the error you’ll get when your package system is broken.

broken_package_mav

To fix it, go to System –> Administration –> Synaptic Package Manager.

broken_package_mav-1

Then select ‘Custom Filters’ on the left menu.

broken_package_mav-2

Next select ‘Broken’ on the left and you’ll then notice package(s) with the red exclamation marks.

broken_package_mav-3

Right-click each package and select ‘Mark for Complete Removal’.

broken_package_mav-4

Then click ‘Apply’ to apply the change. When prompted again, click ‘Apply’ to remove them.

broken_package_mav-5

Enjoy!

Thanks for reading and please come back soon.

38. grub rescue >

Panic! On my dual boot pc, a failed linux upgrade had wiped the linux boot partion.
The Windows partitions is still there, but unbootable: the boot process was struck at a grub error

error: no such partition.

grub rescue >

The MRB had to be rewritten but I had no Windows install CD ready at hand.
By chance, I had a GParted Live CD in the desk drawer.
I've booted it and luckily it had the ms-sys command on board: ms-sys just rewrites a Windows MBR on the HD.
# ms-sys -m /dev/hda
Reboot.
Windows was back up and running.
39- (Solved) No such Partition Grub Rescue Ubuntu Error

How to solve it:-

1- Solution-

To solve it you need to have a working windows 7 DVD To Fix boot and mbr of windows 7.

If you are ready then Insert working windows 7 DVD to your laptop or desktop 's CD-DVD Rom and boot your system to window 7 installing panel.

Now click on Repair Link that showing left hand side like following picture.

Now choose Command prompt option. and write Following two Command to Command write panel.

bootrec /fixmbr

bootrec /fixboot

Once it say Successful then restart your Computer

2- Solution-

Getting Boot-Repair

http://pix.toile-libre.org/upload/original/1335260967.png

1st option : get a CD including Boot-Repair

The easiest way to use Boot-Repair is to burn one of the following disks and boot on it.

Boot-Repair-Disk is a CD starting Boot-Repair automatically.
Boot-Repair is also included in Linux-Secure-Remix.

Remark : you can also install the ISO on a live-USB

2nd option : install Boot-Repair in Ubuntu

- boot your computer on a Ubuntu live-CD or live-USB.

- choose "Try Ubuntu"

- connect to the Internet

- open a new Terminal, then type:

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

- Press ENTER.

- Then type:

sudo apt-get install -y boot-repair && (boot-repair &)

- Press ENTER

40- yum Error..

Today I met an error when I tried running yum commands (like .. yum list, yum install * , yum clean all, yum update, etc) on RHEL-6.0 linux, the error message looked like below:

[root@server ~]# yum list

Error...

-----------------------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------------------
[root@server ~]#
To resolve this issue, we need install ldap and libldap manually ..(can not install it by yum now cause it’s not working):

1- Go to Yum 'Pacakges' Directory..

[root@server ~]# cd /var/ftp/pub/rhel-6/Packages

2- Install 'libdbi*' Package

[root@server Packages]# rpm -ivh libdbi-0.9.10-23.el6.i686.rpm

3- Now Download 'compat-openldap' and then install..

[root@server Packages]# wget 'mirror.centos.org/centos/6/os/i386/Packages/compat-openldap-2.3.43-2.el6.i686.rpm'

[root@server Packages]# rpm -ivh compat-openldap-2.3.43-2.el6.i686.rpm

4- Install Openldap Package..

[root@server Packages]# rpm -ivh openldap-2.4.23-26.el6.i686.rpm

[root@server Packages]# rpm -ivh openldap-servers-2.4.23-26.el6.i686.rpm

5- Check.....

[root@server Packages]# cd -

[root@server ~ ]# yum list

After the installation of these packages, yum commands worked ok.....

41- How to upgrade/maintain Libre Office 3. to 4.

Add the LibreOffice 4.0 repository Run this command in terminal :
# apt-get remove libreoffice
# add-apt-repository ppa:libreoffice/libreoffice-4-0
# apt-get update
# apt-get install libreoffice

42- How To Fix..?
Samba: The process cannot access the file because another process has locked a portion of the file

I had a problem with a SMB share which was sharing storage from an NFS mount.
Whilst you could argue that it is not efficient to share storage this way, sometimes there is a valid need.
The error was displayed when creating a none empty file, or copying a non zero byte file to the storage. The error is displayed, in my case in Windows, in a dialogue box.
Error:

The process cannot access the file because another process has locked a portion of the file

To fix this issue we need to open the smb.conf file on the Samba server

# vi /etc/samba/smb.conf

In the general section of the smb.conf (that is usually the part at the top of the file) add “strict locking = no“. An example of how your smb.conf file may look is below.

----------------------------------------------------------------------------------

[global]

netbios name = sambaserver

workgroup = JAMESCOYLE

security = user

encrypt passwords = yes

strict locking = no

[homes]

comment = %u's Home Directory

browsable = no

read only = no

----------------------------------------------------------------------------------

When strict locking is disabled, the NFS server will only lock the file when the client tells it to. When it is enabled, the NFS server locks the file on every read and write.

43-Adobe Flash Player 11.2 on Fedora 20/19, CentOS/RHEL 6.5/5.10

1. Change Root User

sudo -i
# OR ##su -

2. Install Adobe YUM Repository RPM package

## Adobe Repository 32-bit x86 ##
rpm -ivh http://linuxdownload.adobe.com/adobe-release/adobe-release-i386-1.0-1.noarch.rpm
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-adobe-linux
 
## Adobe Repository 64-bit x86_64 ##
rpm -ivh http://linuxdownload.adobe.com/adobe-release/adobe-release-x86_64-1.0-1.noarch.rpm
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-adobe-linux

3. Update Repositories


yum check-update

4a. Install Adobe Flash Player 11.2 on Fedora 20/19/18/17/16/15/14/13/12, CentOS 6.5/6.4/6.3/6.2/6.1/6 and Red Hat (RHEL) 6.5/6.4/6.3/6.2/6.1/6

Fedora 19/18/17/16/15/14/13/12, CentOS 6 and Red Hat (RHEL) 6 32-bit and 64-bit version

yum install flash-plugin nspluginwrapper alsa-plugins-pulseaudio libcurl

4b. Install Adobe Flash Player 11.2 on CentOS 5.10 and Red Hat (RHEL) 5.10

CentOS and Red Hat 32-bit and 64-bit version

"Sound and Video"
 
yum install flash-plugin nspluginwrapper curl

yum groupinstall

5. Verify that the Flash Player Plugin is working Open Mozilla Firefox and write about:plugins on address bar. Results should look like following:

Adobe Flash Player 64-bit on Firefox 26, installed on Fedora 20 64-bit (x86_64)

Adobe Flash Player on Firefox 26 Fedora 20

CentOS 5.8 and Red Hat 5.8

Then open following page for real testing Adobe Flash Plugin:

44- If you are running Ubuntu and try to run the update manager and receive an error message..Like Below Image..

Then How to Fix This Error ?

Ans.- Check The Below Image..

________________________________________________________________________

Click Back.. Click Home..

https://docs.google.com/forms/d/1iNRZlJJO6rBFizzPcFmyOTEtfkdjhdVRmpM74IbiT3o/viewform

Pages

PROBLEM AND SOLUTION

Ubuntu Netbook Restart Problem

2-There is no "Show Desktop" option

3-Unity launcher auto hide problem

4-Hibernate option missing

5-"Ubuntu 12.04 has experienced an internal error" message

6-Unity Launcher Hiding Behind Other Windows

7-Can't change Ubuntu 12.04 default font

8-Wireless connection doesn't remember password

9-GEdit is too slow

10-Ubuntu 12.04 with low RAM is very slow

11-"Hot Corner" show desktop doesn't work after restart

12-Ctrl+Alt+Backspace doesn't work

13-Touchpad stop working

14-Ubuntu Netbook Restart Problem

17-How to disable Apport error-reporting system in Ubuntu

18-Ubuntu 12.04 - Unity Launcher Hiding Behind Other Windows

19-How to bring Unity Launcher back to front without

restarting the computer and destroying the session

20-Ubuntu 12.04 - How to Change Default Font

21-Ubuntu 12.04 - Wireless Password Remember

22-Ubuntu 12.04 - How to Enable Hibernate

23-How to check if computer supports hibernate in Ubuntu 12.04

24-How to enable hibernate in Ubuntu 12.04 Precise Pangolin

How to clear Apt cache

First method to change pointer size in Ubuntu

Second method to change Ubuntu cursor size

Possible solution(s)

31- Clear and Disable Bash History

How to clear and disable Bash history

35.How to Disable Apport Error Reporting in Ubuntu

36. How to fix error "The system is running in low-graphics mode" ?

38. grub rescue >

1st option : get a CD including Boot-Repair

2nd option : install Boot-Repair in Ubuntu

1. Change Root User

2. Install Adobe YUM Repository RPM package

Fedora 19/18/17/16/15/14/13/12, CentOS 6 and Red Hat (RHEL) 6 32-bit and 64-bit version

4b. Install Adobe Flash Player 11.2 on CentOS 5.10 and Red Hat (RHEL) 5.10

CentOS and Red Hat 32-bit and 64-bit version

Adobe Flash Player 64-bit on Firefox 26, installed on Fedora 20 64-bit (x86_64)

CentOS 5.8 and Red Hat 5.8

Click Back.. Click Home..