Notes to myself and Googlers on installing a virtual hosting control panel Virtualmin (a great add-on to Webmin) on Ubuntu server:

• wget http://software.virtualmin.com/gpl/scripts/install.sh
chmod 755 install.sh
./install.sh
— installs Virtualmin automatically with all dependencies, with a nice skin which is also used by Webmin (which I remember used to be quite ugly by default)
• chmod 711 /var/spool/postfix/var/run/saslauthd — fixes login failure when trying to send mail through virtual server
• it seems apache vhost, ftp, e-mail and DNS is properly configured automatically, will add more info here as I move on with my hosting migration to Virtualmin probably