sudo cp /etc/apt/sources.list /etc/apt/sources.list.001
echo "deb http://download.webmin.com/download/repository sarge contrib" | sudo tee -a /etc/apt/sources.list
sudo apt update
wget -q -O- http://www.webmin.com/jcameron-key.asc | sudo apt-key add
sudo apt update
sudo apt install -y webmin