The Tech-team at RUBRIC are currently using UBUNTU as the O.S. for the development machines. As this is a Debian based system the following information is relevant to the development machines.
Update and upgrade Debian via mirrors for Debain http://www.debian.org/mirror/list
Download Debian using HTTP and FTP http://www.debian.org/CD/http-ftp/
Ask and answer questions using the UBUNTU forums http://ubuntuforums.org/
UBUNTU official website http://www.ubuntu.com/