[ubuntu] help with bash.

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http://ubuntuforums.org – Hi! i am new to ubuntu and linux base OS, and i am trying to learn the command line from a book. in some of the first exercise they theach us to create user account, and i tried but the bash tells me it cannot lock, thus i cant create the user like they showed me. this is what comes up when i try: useradd: cannot lock /etc/passwd; try again later. so please, if anyone can help... i am dying to get started with linux command line! (Hardware)