** Description changed:

  When switching to a guest session, or to a different user, the system
  often freezes. At times this also happens when terminating a guest
- session. Ctrl+Alt+Fn and Ctrl+Alt+Del dont have any effect, and
- apparently also SysReq+key. The only way of regaining control is to
- switch off and on the PC with the power button.
+ session. The system free happens when:
+ 
+ * switching to a guest session from an ordinary user session without 
terminating the active user session
+ * switching to a different user from an ordinary user session without 
terminating the active user session
+ * terminating a guest session initiated from an ordinary user session
+ 
+ Ctrl+Alt+Fn and Ctrl+Alt+Del dont have any effect, and apparently also
+ SysReq+key. The only way of regaining control is to switch off and on
+ the PC with the power button.
  
  My PC has an Intel Core i5 CPU 760 @ 2.80GHz × 4 with 8GB of RAM, a
  450GB hard disk, and an Nvidia Quadro 400 graphics card. I'm running 64
  bit Ubuntu 12.10 with the Noveau drivers.

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https://bugs.launchpad.net/bugs/1129486

Title:
  System freezes when switching to guest session or other user

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