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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