[Merge] lp:~laney/ubuntu-release-upgrader/lp1548858 into lp:ubuntu-release-upgrader

[Brian Murray]

I tested an upgrade from Trusty to Xenial and while it exploded, I was still able to see ubuntu-release-upgrader dialogs about the situation so the bug seems fixed.
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https://code.launchpad.net/~laney/ubuntu-release-upgrader/lp1548858/+merge/286930
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~laney/ubuntu-release-upgrader/lp1548858 into lp:ubuntu-release-upgrader.