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

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https://bugs.launchpad.net/bugs/1085998

Title:
  Complete system crash after installing ubuntu 12.10  on dell xps 15
  (nvidia optimus)

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