Ubuntu Geek posted a tutorial about installing Webmin on Ubuntu 11.04

Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more. Webmin removes the need to manually edit Unix configuration files like /etc/passwd, and lets you manage a system from the console or remotely.

  How to install webmin on ubuntu 11.04 (Natty) server