The official "Ubuntu 11.04 Server Guide" contains information on how to install and configure various server applications on your Ubuntu system to fit your need

The official "Ubuntu 11.04 Installation Guide" contains installation instructions for the Ubuntu 11.04 system (codename "Natty Narwhal").

The official "Ubuntu 11.04 Packaging Guide" is designed for those people wanting to distribute their packages to and for others.

The official "Ubuntu 11.04 Classical Desktop Guide" contains information on how to using Ubuntu in a desktop environment (Classical desktop).

The official "Ubuntu 11.04 Unity Desktop Guide" contains information on how to using Ubuntu in a desktop environment (Unity desktop).