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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