The problem is still not solved.
I could fix the problem with the following change to the code.
In file /usr/bin/unattended-upgrade at line 814 I changed
subject = _("unattended-upgrades result for '%s': '%s'") % (
host(), res)
into
tmp = _("unattended-upgrades result for '%s': '%s'")
subject = tmp % (host(), res)
The error message then disappear.
Note that the same problem
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https://bugs.launchpad.net/bugs/1527106
Title:
Fatal exception failure of unattended-upgrade
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