I wouldn't expect dpkg to know about the database files, but they should
at least be deleted by a package script (prerm?) when the package is
removed/purged.
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I get the same warning when running `sudo apt purge command-not-found`
on Ubuntu Groovy. I suppose these files are generated, but not marked as
part of command-not-found.
`dpkg -S /var/lib/command-not-found` correctly identifies that the
directory is part of
