I changing the status back to unconfirmed because this was caused by a hardware error (at least for me).
** Changed in: linux-restricted-modules-2.6.20 (Ubuntu) Status: Confirmed => Unconfirmed -- In Feisty Fawn, nvidia-glx 1.0.9xxx causes graphical glitches, artifacts and random system crashes https://launchpad.net/bugs/85449 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs