Like cs10 mentioned in this post https://www.virtualmin.com/node/41189, Virtualmin is unable to start ClamAV plus "firstname.lastname@example.org" is not set to start at boot. To immediately enable ClamAV i need to SSH on my server and use "systemctl start clamd@scan" but its not enough as ClamAV will not start at server reboot. For this i must go to Wmin - Bootup and Shutdown and enable "Start at boot time?" in "email@example.com".
Virtualmin is unable to start ClamAV