I was the same problem and we went remove program by program and check. When I remove X11vnc packet my system don't crash the X after two minutes.
Problably don't eliminate the problem but it is a clue for to detect this! -- gnome does not start and restarts gdm back to login screen https://bugs.launchpad.net/bugs/656017 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
