This is because of Optimus and a possible faulty installation of nvidia driver. Please try a clean install and use Bumblebee.
** Changed in: nvidia-graphics-drivers (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1085998 Title: Complete system crash after installing ubuntu 12.10 on dell xps 15 (nvidia optimus) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/1085998/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs