Do I have to restart something?
Edit: sudo apt-get update has no effect.
When I search this on another machine with the SAME sources.list, it works. But, it still doesn't work on this machine.
sudo aptitude search sun-java6-jdk
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You might want to double check that you've got the multiverse repository included. The sun packages are in that one. For example, if you've got:
deb http://www.gtlib.gatech.edu/pub/ubuntu/ jaunty main restricted
you can tack on multiverse to the end to add it.
deb http://www.gtlib.gatech.edu/pub/ubuntu/ jaunty main restricted multiverse