Installing Webmin

Install dependencies for Webmin.

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

Download and add jcameron key.

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

Add Webmin repository to repository list.

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

Install Webmin. (-y bypasses all prompts to answer yes to all of them.)

sudo apt install webmin -y

Open Webmin’s Firewall port.

sudo ufw allow 10000

Enable Firewall (if not previously enabled).

sudo ufw enable

Reload Firewall.

sudo ufw reload