One proposed work around in Python is to change the email.generator
module import:

from email.errors import HeaderWriteError

to graciously support the previous version email.errors:

try:
    from email.errors import HeaderWriteError
except ImportError:
    from email.errors import MessageError as HeaderWriteError

This will work correctly for affected applications as they can't know
about HeaderWriteError yet anyway, so we can't break any except clauses.

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

Title:
  unattended-upgrades broken by python-upgrade

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