Omar, when I gave you the required to use Linux, I didnt know you want it for that purpose.
Linux is based on Command prompt. It is already available on the task bar.
In order to get the latest updates you right:
sudo apt-get update
and
sudo apt-get upgrade
In order to get the java, you have to search for the right command. I dont use java on Linux or Backtrack.
This operating system is mostly for legal-illegal actions, such network penetrations.
And there are no Linux users on that game. I have asked before for some things that I wanted to find out.