Restore/Reset Firefox browser

Suppose something happened your Firefox browser and don't give performance like before. You can Restore the settings with Firefox. This process will backup and retain your bookmarks, passwords and browsing history.

Firefox > Help > Troubleshooting information

GRUB 2 recovery

We often come across a condition in which the boot loader gets corrupt. Here are a few steps that will help you recover your GRUB 2 boot loader.
Boot from a live CD or DVD, which supports GRUB 2 (Ubuntu 9.10 CD or above. A DVD will take more time than a CD, so I suggest you boot from a CD).
Open the terminal and run fdisk -l to check the partition from which you want to recover GRUB 2.
Here I assume that you want to recover it from /dev/sda1.
Then run the following commands:
 
sudo mkdir /media/sda1
sudo mount /dev/sda1 /media/sda1
sudo mount --bind /dev /media/sda1/dev
sudo mount --bind /proc /media/sda1/proc
Now chroot into that partition by running the command given below:

sudo chroot /media/sda1

Then re-install GRUB, as follows:

grub-install /dev/sda

The output should be like what’s shown below:

Installation finished. No error reported.

If you get an error, then try the following command:

grub-install --recheck /dev/sda

After a successful installation, exit from chroot and unmount the file systems that were mounted to recover GRUB. Now reboot.

exit
sudo umount /media/sda1/proc
sudo umount /media/sda1/dev
sudo umount /media/sda1
sudo reboot

You’ve successfully completed recovering your GRUB boot loader.

Information courtesy: EFYTimes News

How to force install .deb package

In certain contexts debian packages are reluctant to install using gdebi or software center due to dependencies problem. In that case, you can install .deb file using following command,

dpkg --force-all -i PackageName

e.g. dpkg --force-all -i google-chrome-stable_current_i386.deb

How to fix E: Could not get lock /var/lib/apt/lists/lock problem

You got following message when you try to run apt-get update command in Ubuntu?

E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/lib/apt/lists/
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

 Solution

1. Search for processes

ps -A | grep apt-get

2. See if there is any process running as apt-get then kill that process

sudo kill -9 

If the error persists, apply following commands in a termina,

sudo su

sudo rm /var/lib/apt/lists/lock

apt-get update

How to Install Broadcom Wireless Driver (BCM4313) in Ubuntu / Xubuntu 12.04

I tried following method to install Broadcom wireless Driver with Dell Vostro 3500  in Ubuntu/Xubuntu 12.04 (64 bit) Linux.

First of all check your wireless chipset model number,

lspci | grep Network

Install following prerequisites,

sudo apt-get install linux-headers-generic build-essential dkms

Download the package from here,

Open following file,

gedit /etc/modprobe.d/blacklist.conf

Add following lines,

blacklist b43
blacklist b43legacy
blacklist bcma
blacklist ndiswrapper

Comment the following line,

# blacklist bcm43xx

Restart laptop and check wireless working or not.

Mobile media converter

Mobile Media Converter is a helpful tool for mobile users to cross platform transfer of media files. It can handle various formats like MP3, Windows Media Audio (wma), Ogg Vorbis Audio (ogg), Wave Audio (wav), MPEG video, AVI, Windows Media Video (wmv), Flash Video (flv), QuickTime Video (mov) and commonly used mobile devices/phones formats like AMR and 3GA audio (amr) and 3GP video.

Here is the link to mobile Media Converter

Install HP LaserJet P1108 printer in Ubuntu 12.04

Visit the following page to install HP Laserjet P1108 in Ubuntu 16.04 / Debian 8.
http://linuxhalwa.blogspot.in/2017/06/install-hp-laserjet-p1108-printer-in-ubuntu.16.04.html

You can find that HP LaserJet P1108 do not work simply adding printer with Ubuntu 12.04. You have to execute following commands to configure the printer. 


sudo apt-get install python-qt4
sudo apt-get install hplip-cups
sudo hp-setup -i

User settings,

sudo adduser vimal lp
sudo adduser vimal lpadmin

Replace vimal with your user name. 

Install Drupal on Ubuntu 12.04

Drupal is an Open Source content management system. Drupal is very powerful, flexible and popular among web developers. Whitehouse website build on Drupal.

Now Drupal is now available with Ubuntu 12.04 software repository and very easy to install. Please follow the instructions to install Druapl on your Ubuntu 12.04 server or desktop.

Install LAMP server
LAMP package contain MySQL, Apache and PHP.

apt-get update
apt-get upgrade
apt-get install lamp-server^

Enter MySQL root password during installation. 

Enable rewrite function in Apache,

sudo a2enmod rewrite
sudo service apache2 restart

Install Drupal

apt-get install drupal7

Check which version of Drupal is available latest and change version number.

Add Drupal configuration for Apache,

sudo cp /etc/drupal/7/apache2.conf /etc/apache2/mods-enabled/drupal.conf

Restart Apache

sudo service apache2 restart

Open a browser and type the address and proceed with installation process,

http://127.0.1.1/drupal7/install.php

Update Drupal to latest version using Drush
Drush is a command line shell and scripting interface for Druapl.

sudo su 
apt-get install drush

Check new Drupal updates available. Enter inside the Drupal installation place and apply following commands.
cd /usr/share/drupal7
drush up -n | grep available
drush up

Information courtesy: https://help.ubuntu.com/community/Drupal

To know wireless card information in your laptop?

To find wireless card model number is essential to install suitable driver. Execute following command in a terminal to display wireless driver information,

lspci | grep Network

How to know your computer architecture (32 / 64 bit) ?

Open a terminal and type following command,

uname -m

Result

i686 = 32 bit
x86_64 = 64 bit

Another command is

lscpu

Here is the result from my 64 bit PC,

 

How to clear all data in a column in a MySQL database table

In certain cases its essential to clear all data in a particular column in a table.
For example a database name is school
There is a table inside school is student
A column inside school is email 

Column email contains email ids of about 100 students.
Apply following command, if you want to clean all email id entries from email column.

mysql -uroot -p  [enter mysql root password]

You can get mysql command prompt, enter following commands there;

use school;
UPDATE `student` SET `email` = '';
quit;

Now email column inside student table is clean.

Install Flash player in Ubuntu using command

Here is the command,

sudo apt-get install flashplugin-installer

How to find CPU architecture information

In certain situations, you have to find PC architecture (32 bit / 63 bit) for various purposes. Here is a simple command to display Linux architecture information.

lscpu

The result is,

Install Whisker menu on Xubuntu 12.04 /XFCE 4

Whisker menu is an application launcher available with XFCE 4. Very easy to find and launch applications with the help of Whisker menu.

 

Install  Whisker menu on Xubuntu 12.04

Apply following commands,

sudo add-apt-repository ppa:gottcode/gcppa
sudo apt-get update
sudo apt-get install xfce4-whiskermenu-plugin

Remove your default menu and add Whisker menu from panel properties.

Panel > Add New Items > Whisker Menu

View your network information

This command is helpful to collect information about your network details.
Open a terminal and apply following command,

nm-tool

See the result.