How To Upgrade An Ubuntu 7.10 Server ("The Perfect Setup" + ISPConfig) To Ubuntu 8.04 LTS

This article explains how you can upgrade an Ubuntu 7.10 (Gutsy Gibbon) server to Ubuntu 8.04 LTS (Hardy Heron). I'm using an Ubuntu 7.10 server, set up according to The Perfect Server - Ubuntu Gutsy Gibbon (Ubuntu 7.10) and with ISPConfig installed, with web sites, email and ftp accounts, databases, DNS records, etc., and upgrade it to Ubuntu 8.04 LTS.