Ubuntu Unleashed 2008 Edition: Covering 8.04 and 8.10
Ubuntu Linux Bible
Beginning Ubuntu Linux: [the complete introduction to Ubuntu ; fully revised and updated for 10.04]
Ubuntu for Non-Geeks: A Pain-Free, Project-Based, Get-Things-Done Guidebook
A Practical Guide to Ubuntu Linux
Ubuntu Kung Fu: Tips, Tricks, Hints, and Hacks
Ubuntu MATE User Guide
Ubuntu GNU-Linux: Das umfassende Handbuch, aktuell zu Ubuntu 10.04 LTS »Lucid Lynx«
Beginning Ubuntu Linux, Fourth Edition
Ubuntu server essentials: unleash the true potential of Ubuntu server in your production environment using this administration guide
Beginning Ubuntu Linux, Third Edition
Instant Ubuntu: Your complete guide to making the switch to Ubuntu
Linux Bible, 2008 Edition: Boot up to Ubuntu, Fedora, KNOPPIX, Debian, openSUSE, and 11 Other Distributions
Ubuntu Certified Professional Study Guide
Linux Bible: Boot Up to Fedora, KNOPPIX, Debian, SUSE, Ubuntu , and 7 Other Distributions
Getting Started with Ubuntu 10.10
Linux Bible: Boot Up to Fedora, KNOPPIX, Debian, SUSE, Ubuntu, and 7 Other Distributions
Getting Started with Ubuntu 12.10