Install Webmin on Ubuntu 20.04

sudo apt update

sudo apt install wget apt-transport-https software-properties-common

wget -q http://www.webmin.com/jcameron-key.asc -O- | sudo apt-key add -

sudo add-apt-repository "deb [arch=amd64] http://download.webmin.com/download/repository sarge contrib"

sudo apt install webmin

sudo systemctl status webmin

sudo ufw allow 10000/tcp

sudo ufw reload

https://server-ip:10000/