More links have been added, old links updated (6.06 -> 8.04). Please feel free to contact a staff member if you have a link that you feel belongs in this list.
Servers
Ubuntu 18.04 Server Guide
Ubuntu Wiki - Apache
Ubuntu Wiki, Community - Apache, PHP, and MySQL
Detailed Debian + Webmin (web based graphical interface) guide, with screen shots
Security
Security sticky (links to HIDS and NIDS)
Ubuntu Forums Security Section
Ubuntu wiki, Community - SSH guide
Ubuntu Security Guide - UFW
Ubuntu wiki community - UFW (Configure your firewall [iptables] )
Securing Debian Manual
Boot Options
New syntax for boot options in Ubuntu Server 14.04.2
