Linux Shout published a tutorial about installing Virtualmin on Ubuntu 20.04 or Debian 10.
Install and Configure Virtualmin on Ubuntu 20.04 / Debian 10 Server
Start hosting a website by configuring & installing free and open source Webmin & Virtualmin hosting control panel on Ubuntu 20.04 LTS server
Install and Configure Virtualmin on Ubuntu 20.04 / Debian 10 Server