**Just to clear things up:
The problem seems to be related to the update process from Jaunty to Karmic and not Karmic itself. As when I made a clean install for Karmic, the problem completely disappeared.
[Conclusion:- As a workaround, you can try a clean install from scratch]
**So, can all you please confirm doing an update form Jaunty to Karmic?
**Just to clear things up:
The problem seems to be related to the update process from Jaunty to Karmic and not Karmic itself. As when I made a clean install for Karmic, the problem completely disappeared.
[Conclusion:- As a workaround, you can try a clean install from scratch]
**So, can all you please confirm doing an update form Jaunty to Karmic?