I loaded Ubuntu on one of my computers. My son wants to play a certain game that requires Java. I down loaded that no problem. Now Linux wants me to enter my password. I never gave it one, really I didn't. It doesn't believe me.
I read through the instructions for installing "Java self extracting" and they lost me at "change the executable.... "
Help.
Sounds like you downloaded Java from the web site. As others have pointed out, you can just install it from the repos (and it's better tested that way). Open a terminal and type:
sudo apt-get install openjdk-6-jre
You'll have to enter your user password. After that, your game should work.