While we're debating workarounds, to note:

This issue affects unattended-upgrades only once, in a non-default
configuration and does not break the ability to install upgrades. After
the upgrade ran, the next upgrade will work correctly (as it will have
imported the new email.errors due to restarting).

This may not just affect unattended-upgrades. Third-party applications
may be affected if

1. they use email.message to send or generate emails, and
2. they have not send an email prior to the update, and
3. they want to send an email after the update

Their failure case may be worse in that they graciously handle failure
and end up not crashing, and need a manual restart to be able to send
emails again.

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https://bugs.launchpad.net/bugs/2080940

Title:
  unattended-upgrades broken by python-upgrade

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