I had this problem today, If I start Google Chrome or Chromium it logs me out of X.
uname -a gives Linux garethf-System-Product-Name 3.5.0-19-generic #30-Ubuntu SMP Tue Nov 13 17:48:01 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux and I'm using propriety NVIDIA-Linux-x86_64-310.19 The Xorg.0.log showed a NULL deref in /usr/bin/Xorg. I can only guess that some of the kernel headers must have updated yesterday as it was working fine, but not enough for the nVidia driver not to work. I fixed it by rebuilding the propriety nVidia drivers. All seems to be working fine now, might be related to this so posting just in case it helps anyone. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/980519 Title: Random log off in Ubuntu 12.04 LTS To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/980519/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs