Webmin is a Web-based configuration tool used for Unix systems, and newer versions are available for use on Windows systems as well. The first stable release was August 28, 2010. Webmin is used to configure the operating system of a computer, configuring things like users, disk quotas and services. Reinstalling Webmin is a simple process that requires you to input a few lines of code through a command prompt on the computer.
Go to Webmin's website (see "Resources"), and download the version of Webmin that is compatible with your machine and OS.
Open the command-line interpreter on your machine. For Windows, this is "Command Prompt," whereas on Kubuntu it is the "Konsole." Each OS has a different name for it.
sudo apt-get install perl-libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl libmd5-perl
This downloads the required packages for Webmin installation.
sudo dpkg --i
After the -i, enter in the full file name for your file of Wemin. For example, the file name for Ubuntu is: webmin_1.470_all.deb
Open up the file from your "Programs" list and enjoy.