This book is designed as an Ubuntu server reference, covering the Ubuntu servers and their support applications. Server tools are covered as well as the underlying configuration files and system implementations. The emphasis is on what administrators will need to know to perform key server support and management tasks. Topics covered include software management, Upstart service management and runlevels, AppArmor security, and the Network Time Protocol. Key servers are examined, including Web, FTP, CUPS printing, Samba Windows shares, and the Domain Name System.