Troll:
Avoid updating Ubuntu Lucid Beta 1
There have been some updates that came out after the release of Ubuntu Lucid Beta 1 that break gnome-panel and nautilus. If you have install or upgraded to Ubuntu Lucid beta 1, please avoid applying more updates for now. The problem will hopefully be fixed soon.
Please note: Installing Ubuntu Lucid beta 1 is safe, the problem are with some new updates that came out after the beta release.
Jolesz nekem a "stable".
Edit: Jahogy ez K betus. Jolvan nemszoltam :)