This particular part of the Traceback seems worth fixing:

  File 
"/tmp/ubuntu-release-upgrader-4aooz0fb/DistUpgrade/DistUpgradeController.py", 
line 1166, in doDistUpgrade
    self._view.getTerminal().call(cmd)
  File 
"/tmp/ubuntu-release-upgrader-4aooz0fb/DistUpgrade/DistUpgradeViewGtk3.py", 
line 377, in call
    (success, pid) = self.term.spawn_sync(Vte.PtyFlags.DEFAULT,
AttributeError: 'Terminal' object has no attribute 'spawn_sync'

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https://bugs.launchpad.net/bugs/1413270

Title:
  Utopic -> Vivid upgrade displays failure warning

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