Preparing your system
Open the terminal and run the following command
Now you need to dpwnload webmin deb package using the following command
Install downloaded package using the following command
This will install webmin now you need to access https://ubuntu-serverip:10000
Ubuntu in particular don't allow logins by the root user by default. However, the user created at system installation time can use sudo to switch to root. Webmin will allow any user who has this sudo capability to login with full root privileges.
Once you logged in you should see similar to the following screen