[Merge] lp:~takluyver/unattended-upgrades/py3 into lp:unattended-upgrades

[Thomas Kluyver]

I've just noticed that test_in_chroot.py isn't run with the other tests. It appears to fail on Python 2. How much attention should I pay to it?
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https://code.launchpad.net/~takluyver/unattended-upgrades/py3/+merge/110684
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~takluyver/unattended-upgrades/py3 into lp:unattended-upgrades.