You've got the nvidia kernel module loaded, ie. proprietary drivers installed, and got the crash when using the free one. That combination is not supported.
** Changed in: xorg-server (Ubuntu) Status: Confirmed => Invalid -- Xorg crashes suddenly https://bugs.launchpad.net/bugs/373888 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp