With all the people out there willing to offer help on Linux, getting started should be pretty easy. But with many options in introductory books and easy-to-install distributions, choosing a place to start can be the hard part.
The article is found at PCWorld
A new user who installs Ubuntu and does things the Ubuntu way will find himself or herself acting in many ways like a cautious, experienced sysadmin without realizing it. Now, in A Practical Guide to Ubuntu Linux, you can get a thorough Linux intro book that works the Ubuntu way, while still drawing on the author's long experience with old-school Unix and older Linux environments to cover the basics that haven't changed.