TechniFul

Ubuntu has dropped including Sun/Oracle Java in its repository, and added OpenJDK. But, the former is more reliable than latter, and is also must for some applications. Here is a way to add Sun java 6: sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java6-installer Possible error : "couldn't connect to host" To make this version as default: here . If you want to install java 7, instead of last command try sudo apt-get install oracle-java7-installer If you are under proxy network or seen a error like Cannot add PPA: 'ppa:webupd8team/java'. Please check that the PPA name or format is correct. and if you are sure that the PPA is working, the try sudo -E add-apt-repository ppa:webupd8team/java and proceed with remaining commands.

This error will be resulted mostly because of the user permissions. To go through it, we need the simulate the initial login mode: sudo -i Now run the commands which resulted in the above error, but without prefixing with 'sudo'. Remember to go out of this mode after running your commands. To go out: exit