Thanks for your report.
It looks like the previous install has failed and has left man-db unconfigured.
If it's still an issue you can recover with the following command
dpkg-reconfigure man-db
or
dpkg --configure -a
Please tell us if this helps.
** Changed in: man-db (Ubuntu)
Status: New => Incomplete
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package man-db 2.5.2-2 failed to install/upgrade: package man-db is already
installed and configured
https://bugs.launchpad.net/bugs/299193
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