The first how-to to setup Ubuntu 5.10 as a server has been launched at Howtoforge. Enjoy.
Here you are. The guide covers on 6 pages:
… the steps to be taken to setup a Ubuntu based server (Ubuntu 5.10 – Breezy Badger) that offers all services needed by ISPs and hosters (web server (SSL-capable), mail server (with SMTP-AUTH and TLS!), DNS server, FTP server, MySQL server, POP3/POP3s/IMAP/IMAPs, Quota, Firewall, etc.).
The article is a remake of the Hoary guide found here at Debian-news too.