If you have been wanting to try out Ubuntu Linux and you feel a good learning resource or Guide is what is  stopping you from the switch, then Ubuntu Pocket Guide is what you should be looking at. This book is a concise companion for your day-to-day Ubuntu use. This book is completely available for FREE download although you order the print version from Amazon. 

The book has been divided into 7 chapters, each of which focuses on core competencies and background knowledge needed to be an expert Ubuntu user starting right from the basics. The language is readable, accessible, and easy to understand—even if you've never used Linux before. The material inside covers Ubuntu 8.04 and Ubuntu 8.10.

The Seven (7) chapters teach you how to install Ubuntu linux from the scratch, followed by tips to configure it on your system. Then it takes you through the GUI of ubuntu, user and filesystem management, the command line, software management followed by system security. The content is so lucid that you can cover each chapter in one day, thus seven chapters take you seven days to finish and then no looking back.

To get the PDF Edition (eBook) entirely free of charge head over to their Download Site. You could also order a print version of the book from Amazon.

Related: Become a Fedora Linux guru for FREE, Fedora Cheat sheet.