The problem here is funny:

`Message.as_string()` imports `email.generator` when called.

Now, `email.generator` has been updated to the security update that
depends on the new class `HeaderWriteError`.

But we already had imported `email.errors` earlier, in either of the
`email.charset` or `email.message` imports - so it is still at the old
version and does not have the class.

** Also affects: python3.10 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: python3.8 (Ubuntu)
   Importance: Undecided
       Status: New

** Tags added: regression-update

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

Title:
  unattended-upgrades broken by python-upgrade

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