Prepare your system
Now you need to install webmin from APT repositoryYou need to edit the /etc/apt/sources.list file and add the following lines Save and exit the file
Now you need to download GPG key
Update source list
Install webmin using the following command
This will install webmin now you need to access https://your-server-ip: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
Congrats, you are Succesfull install webmin on Ubuntu Quantal 12.10