Thanks cheater,
I missed an update!
Version 1.6.0.02 works fine on Ubuntu, too.
Bad news is that this JDK-Version is not available through Adept. (Only version 1.6.00 the one with the bug!)
I'll leave a note in the playground.
[edit]
Here's the note
http://www.arduino.cc/playground/Linux/Ubuntu
[/edit]
Eberhard