Here is the 5 minutes installation steps:

sudo su
sudo apt-get update
sudo apt-get install tasksel
sudo tasksel
sudo apt-get install nano

sudo nano /etc/apt/sources.list
Enter this entries, then save & exit:
deb http://download.webmin.com/download/repository sarge contrib
deb http://webmin.mirror.somersettechsolutions.co.uk/repository sarge contrib

cd /root/
wget http://www.webmin.com/jcameron-key.asc
sudo apt-key add jcameron-key.asc
sudo apt-get update
sudo apt-get install webmin

sudo apt-get install apache2-suexec-custom
cd /etc/apache2/suexec
sudo nano www-data
Change the ‘/wwwroot’ to:
/home
apache2ctl restart