Excerpt:

Written by award-winning author Keir Thomas, Ubuntu Pocket Guide and Reference is a totally unique and concise guide for everyday Ubuntu use. It's the world's most popular Ubuntu book, with over half a million readers (and rising!).

Focuses on core competencies and background knowledge needed to be an expert Ubuntu user;
Readable, accessible, and easy to understand—even if you've never used Linux before;
100% new and original! Written from the ground-up to cover Ubuntu 8.04 and 8.10.