After reinstall Unity does not freeze immediately. It is usable for a while, 
then randomly the network drops, and the freeze occours.
Dmesg outputs a couple of drm errors.

[drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt
ring idle [waiting on 9004, at 9004], missed IRQ?

** Attachment added: "Screenshot"
   
https://bugs.launchpad.net/unity/+bug/879343/+attachment/2595515/+files/20111113120.JPG

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https://bugs.launchpad.net/bugs/879343

Title:
  Unity freezes when trying to connect to a network.

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