Installing Webmin
This will cover installing Webmin onto a fresh copy of Ubuntu Server.
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. See the standard modules page for a list of all the functions built into Webmin, or check out the screenshots.
First you will need to download the package:
wget http://prdownloads.sourceforge.net/webadmin/webmin_1.760_all.deb
Then you will need to extract and install the package:
dpkg --install webmin_1.760_all.deb
Ubuntu will complain about missing dependences, so you will need to issue this:
apt-get install perl libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl apt-show-versions python
This info was taken from the instructions provided from Webmin Debian Install