I honestly couldn’t see how to post on the blog post (so please tell me if I’ve missed it) but surely https://forumite.co.uk/how-to-install-webmin-on-linux-mint/ is overkill.
I haven’t used Mint for a long while, but on both Arch and Debian it was just a straight forward install, and the dependencies are taken care of.
I would expect “sudo apt-get install webmin” to take care of everything on Mint?
Arch Linux, on a Ryzen 7 1800X, 32 GB, 5 (yes -5) HDs inc 5 SSDs, 4 RPi 3Bs + 1 RPi 4B - one as an NFS server with two more drives, PiHole (shut yours), Plex server, cloud server, and other random Pi stuff. Nice CoolerMaster case, 2 x NV GTX 1070 8GB, and a whopping 32" AOC 1440P monitor.