Has anybody purchased this book? Is it available at book stores or only for online purchase? Is it worth buying. If it covers some advanced topics on system management using debain tools, more on apt and package management and stuff, I'd like to buy the book. I have some saved up, so if it is a good book I may consider purchasing it. And it seems it has some info on ubuntu community, so if the topic coverage is good, I feel it would be nice to buy it. Your opinions plz.