Due to the new Java license, Oracle JDK was removed from Ubuntu repository and it doesn’t be hosted in the PPA.
If you want to use Oracle Java instead of OpenJDK Java Runtime in Ubuntu. You can use private PPAs that provide installer to automatically download Oracle Java JDK 7 from its official website and install it on your computer.
Note: These PPA may or may not work, use it at your own risk!
First, open up a terminal window and remove OpenJDK by command:
sudo apt-get purge openjdk*
Then, addand install Oracle Java (JDK) 7 in Ubuntu 10.04/10.10/11.04/11.10/12.04:
sudo add-apt-repository ppa:eugenesan/java sudo apt-get update sudo apt-get install oracle-java7-installer
Webupd8 Team also built afor the installer which includes JRE and the Java browser plugin
sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java7-installer
After that, search java in the Dash and check it in Java Control Panel: