"bsddb.db" is not a filename.might think I'm stubborn but this doesn't get me any closer to the solution.
I don't know what is the name of the database file (or the directory it's pathed under).
I don't know whether the database file was "installed" (and would be listed to "installed files" pane in Synaptic)
or was created on-the-fly during first run of the program.
Yeah, celery or whatever is mentioned in the the stackOverflow topic isn't "font-manager",
but the suggested solution is applicable, in general:
check the permissions of the database file (and its parent directory) to ensure your user has write permission.