Change default keyboard on Linux

sudo vi cat /etc/default/keyboard

XKBMODEL="pc105"
XKBLAYOUT="us"
XKBVARIANT=""
XKBOPTIONS="" 

Save and reboot

How to install Java 7 on Ubuntu 12.04 LTS

1. Add the “WEBUPD8″ PPA.

danesh@python:~$sudo add-apt-repository ppa:webupd8team/java

2. Update your repositories.

danesh@python:~$sudo apt-get update

3. Install JAVA 7 JDK.

danesh@python:~$sudo apt-get install oracle-java7-installer

To uninstall,

sudo apt-get remove oracle-java7-installer