First of all, I don't understand the 3 prior reviews, they seem to be people who enjoy making negative remarks instead of actually looking at who the audience of a book is and providing insight to potential buyers about what they will find in the book.
This book is an entry level guide for getting into Ubuntu system administration, as the descriptions says. I remember the first time I installed Slackware Linux on my Packard Bell 486 with 90+ floppy disks in 1994 and unfortunately, the installation screens on any version of Linux haven't come much further.
Ubuntu is the first Linux that makes a concerted effort to focus on the user, and if users download a copy of Ubuntu, they need something to walk them through the install, setup, patching, and administration process. The skill level of an Ubuntu user is generally going to match up nicely with this book. Yes, you can find out most of this information on the Internet if you spend days/weeks searching, but why not just drop .99 and have it all in one spot to refer to on your Kindle app?
Ronald's book does a great job of walking a user through the ins and outs of not only HOW to do all of the tasks associated with installation and system administration, but they WHYs as well.
Technical jargon that may not be familiar to new system administrators is explained, full color screen shots are given for reference, and examples of package installation and removal are given.
For 99 cents I think this book is well worth it, especially if you are new to Ubuntu or Linux in general and want to have a guide to assist you in installing and setting up an Ubuntu Linux installation. If you are looking for a deep dive into Ubuntu or you are a seasoned professional that already has Ubuntu installed and are looking to slice and dice it 6 ways to Sunday, look elsewhere.