[ubuntu] where to start

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http://ubuntuforums.org – After years of suffering with windows I have made the move to ubuntu. I am a complete newbee to any linux based system. I like what I have used so far, but after the basics of web surfing, and email, I get lost quickly and frustration sets in. I know I have a lot to learn, but I don't know where to start. Can someone point me to a reference, book, etc that help me. General searches on the web for things like learning ubuntu are not very helpful. (Hardware)