When running Virtualmin >> System Settings >> Re-Check Configuration I see normal results up to the "Plugin AWstats" test ...
From that point I see
Plugin AWstats reporting is installed OK.
The mailman queue processor /var/lib/mailman/bin/qrunner is not running on your system. It can be started in the Bootup and Shutdown module.
.. your system is not ready for use by Virtualmin.
When checking the Bootup and Shutdown module, mailman shows "Start at Boot" = yes and "Running now?" = unknown