This can also be observed in /var/log/dist-upgrade/main.log:
VarLogDistupgradeMainlog.txt:2014-12-16 20:21:57,758 ERROR got error
from PostInstallScript ./xorg_fix_proprietary.py ('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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