Thanks for this additional information.
The problem here is mozilla-thunderbird leaves auto-generated files
around. It should delete them in the postrm script.
Cheers,
Michael
** Also affects: mozilla-thunderbird (Ubuntu)
Importance: Undecided
Status: Unconfirmed
** Changed in: apt (Ubuntu)
Status: Needs Info => Rejected
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purging configuration files does not do its job
https://launchpad.net/bugs/54167
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