This is the fastest and easiest way I’ve ever found to install webmin on a fresh Ubuntu 10.04 server.
UPDATE 12/8/2012: Confirmed that this method works for a vanilla Ubuntu 12.04.1 LTS server.
wget -c http://www.webmin.com/download/deb/webmin-current.deb
File will be named “webmin-current.deb” in your current working directory as opposed to a filename containing the specific version number of webmin.
sudo dpkg -i webmin-current.deb
This command will generate a number of errors. Ignore them.
sudo apt-get -f install
This command will install the missing dependencies, recompile, and install webmin.
Now, login to your webmin server. https://[serverIP]:10000
This method works as of today on a vanilla install of Ubuntu server 10.04 LTS with webmin version 1.580 as the current version.