Webmin is a web-based interface for system administration for Unix/Linux. Using any browser that supports tables and forms (and Java for the File Manager module), you can setup user accounts, Apache, DNS, file sharing and so on.
Webmin consists of a simple web server and a number of CGI programs which directly update system files like /etc/inetd.conf and /etc/passwd. The web server and all CGI programs are written in Perl version 5, and use no non-standard Perl module
First you need add Webmin official repository and make sure that all packages are up to date.
And add the following lines:
deb http://webmin.mirror.somersettechsolutions.co.uk/repository sarge contrib
~$ sudo wget http://www.webmin.com/jcameron-key.asc
~$ sudo apt-key add jcameron-key.asc
Install Webmin with the following command:
~$ apt-get update
~$ apt-get install webmin -y
Now, allow the Webmin default port via a firewall: