added webmin instructions

Runbooks/linux.md

@@ -167,4 +167,15 @@ sudo apt install qemu-guest-agent
 sudo shutdown 
 ```
 
+### Install Webmin
+```
+sudo apt install software-properties-common apt-transport-https
+sudo 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 ufw allow 10000/tcp
+sudo ufw reload
+```
+
+
 ### Logging with Prometheus