@Ethan: Thanks for the test and the logs.

Those show that the fix works but the move to minimal steps slowed down u-u a 
lot. I tried fixing the slowdown by finishing the concept of pre-calculating 
the steps then performing them but IMO this direction is not safe and can 
potentially leave packages not-upgraded due to inter-dependencies between 
pre-calculated upgrade steps:
https://github.com/mvo5/unattended-upgrades/tree/feature/minimal-upgrades-speedup2

I'm now profiling u-u instead to find where the slowdown is coming from
and try fixing that instead of pre-calculating the steps.

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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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