A regular blog reader asked me for recommendations on books to learn Unix, and which Unix to learn. Michael Lucas’ book Absolute BSD, 2nd Ed is probably the best pure introductions to Unix administration available. If you’re more inclined to use Linux everywhere, then I suggest Debian on servers and Ubuntu on your desktop. For me, Ubuntu “just works” for me, I don’t worry about anything. That’s what I want in a more fluid environment like a desktop like a computer.”]
Source: https://taosecurity.blogspot.com/2009/01/recommendation-for-introduction-to-unix.html