The book I would recommend is
Keir Thomas and Andy Channelle with Jaime Sicam " Beginning Ubuntu Linux fourth
edition: by Apress ISBN : 978-1-4302-1999-6
List price is $40.00, Copyright 2009.
Add note : I purchased this book on January 9th 2010 from Amazon under the list
price. However checking now the book is being sold above list price at Amazon by
other sellers and is completely sold out from Amazon. I tried other book sellers
and new books were sold out. The last link is most likely your best chance if
you decide to purchase this book.
www.amazon.com/.../ref=sr_\
1_1?ie=UTF8&qid=1266070770&sr=8-1
search.barnesandnoble.com/.../isbninquiry.asp\
s=-1&EAN=9781430219996
http://www.allbookstores.com/book/9781430219996