I have upgraded my home PC from Precise to Quantal today. The upgrade process was mostly smooth and I was able to fix a few glitches that did happen afterwards (this is not the first time I do a live Kubuntu system upgrade after all). However, one last annoying bug remains adamant to all my efforts to fix it. Every time I try to log out of the KDE session it does not work: the screen goes black and the system locks up for 30-40 seconds (even keyboard is locked), then the computer reboots. Same thing happens when I run "sudo service lightdm restart" from console. I have searched the Web and Launchpad bug reports but found nothing related to my problem. Note, this system uses nvidia-current drivers from X-Updates PPA (304.64) with GeForce GT 520 video card. Everything else works fine: desktop effects, audio, network, etc. Only the logout sequence causes a system crash and hard reboot.
Any ideas?
Any ideas?
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