I wouldn't buy this book, the problem is I did.
I have tried about half a dozen things using Ubuntu Unleashed and NOT ONE has worked for me. There seems to be a hangover from previous publications, in fact a really cynical person might say that they just did a find and replace on the word Ubuntu from, say, debian or something - most of the commands in the book don't seem to be recognised by my Ubuntu anyway...or it might be the case that it is trying to be a guide for everyone and ends up guiding noone. The Windows of reference books.
There is a section on introduction to Linux which I found highly confusing and quickly found a better, bookmarkable, searchable explanation online for free using Google. After this happened a dozen times, I started to get angry with the book and the fact I'd spent 50euro on it and still have nothing better than Google to guide me.
Publishers philosophy:
"Make a really big thick book and people will think its the ultimate guide to the thing, and you can charge a premium for that"
Don't be fooled like I was.