Configure hostname
You should double confirm the system hostname if it looks good. For example if this host is www.example.com, the /etc/hostname can be:
host.example.com
The /etc/hosts should also be:
127.0.0.1 localhost
127.0.1.1 host.example.com host
Now reboot your system, and check the system hostname with command:
hostname
Ensure all APT source enabled
By default some of your APT source may be disabled, so let’s enable them with:
sed -i 's/^#\s*deb/deb/g' /etc/apt/sources.list
Install Virtualmin with GPL installation script (not available yet on 2012-04-30)
Just simply access http://www.virtualmin.com/download.html and download the Virtualmin installation script with wget:
cd /tmp
wget http://software.virtualmin.com/gpl/scripts/install.sh
/bin/bash /tmp/install.sh