Install Webmin on Ubuntu 20.04/18.04/16.04

Step 1 – Configure APT Repository

1. sudo vi /etc/apt/sources.list.d/webmin.list.
2. curl http://www.webmin.com/jcameron-key.asc | sudo apt-key add -
3. sudo apt-get update sudo apt-get install webmin.
4. /usr/share/webmin/changepass.pl /etc/webmin root new_password_here.