You need to install the following packages
udo apt-get install perl libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl libmd5-perl
Download latest webmin
wget http://prdownloads.sourceforge.net/webadmin/webmin_1.340_all.deb
Install webmin
sudo dpkg -i webmin_1.340_all.deb
If you get any errors run
sudo apt- get install -f
Webmin should now be running at https://localhost:10000/