@Ethan Based on profiling real-life scenario (updating unstable with 100+ 
packages) I believe I was able to make u-u ~10 > times faster that should bring 
down the time of your test of upgrading xenial with all security updates to 
below one hour.
Since running only dpkg's part took more than 30  minutes I think this state is 
good for Artful and for backporting the fixes to older releases.
I've set up a separate PPA for u-u testing if you would like to verify the 
speedup & other fixes:
https://launchpad.net/~rbalint/+archive/ubuntu/unattended-upgrades

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https://bugs.launchpad.net/bugs/1690980

Title:
  unattended-upgrades does not block shutdown of system, as it is
  designed to

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