Installing Java on Ubuntu 12.04

Open Terminal and Clean up the absolute java by giving following command

sudo apt-get purge openjdk*
Then give this commands

sudo add-apt-repository ppa:eugenesan/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

After above command issue this commands

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer


If above method does not work go for this


wget https://github.com/flexiondotorg/oab-java6/raw/0.2.1/oab-java6.sh -O oab-java6.sh
chmod +x oab-java6.sh
sudo ./oab-java6.sh


Else follow this link : Configure Sun Java