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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