[nutario]

I think eclipse is better, because it is more variable than netbeans. But it depense on which programming language you'll use.

Off topic:
I'm using ubuntu too.
When you have installed eclipse from the official ubuntu server it will probably not work.
But when you take the IDE from eclipse.org for Linux, you should not have any problems with java. Especially not when you are using the offical java from sun. For c++ or c you nead the gcc too (you surely now).