I have this bug too...some observations:

* lightdm-gtk-greeter runs at 100% CPU.
   Ctrl-Alt-F1, login, run 'top'
* if I click left or right mouse button, the login screen appears and CPU usage 
goes back to normal.

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https://bugs.launchpad.net/bugs/1415256

Title:
  Errors entering single-user mode; hang going back to multiuser

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