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I have a simple question and I do not know if the answer is around, but I did not find it. My question is "why whenever I type fglrxinfo in the terminal its says command not found and when I was on Ubuntu 11.10 It was working correctly.

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Did you change videocard in between? ;) Or did you not install the graphics driver yet. – Rinzwind May 19 '12 at 17:30

You need to install fglrx package to do this command.
Open the terminal, and issue this command
sudo apt-get install fglrx

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fglrxinfo is associated with ATI/AMD graphics driver. You need to install ATI binary X.Org driver from ubuntu software center.

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