[ubuntu] Recovering lost Password?

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http://ubuntuforums.org – Hello, I haven't used my desktop in about two years and I can't, for the life of me, remember my password. It's not too much of a pain, other than that when the pc sleeps and is awaken, I need the PW to unlock it, though, start up doesn't need a PW, it's weird. Anyway, I've tried holding Shift during boot up, but nothing happens, at all. What else can I do to get into Recovery Mode? Or, how else can I change/find out my old and long forgotten PW? Please help, thanks! (Hardware)