[ubuntu] Can't use external monitor

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http://ubuntuforums.org – I have a msi A6000 laptop with a nvidia GeForce 8200m. I have installed the recommended proprietary driver for the graphics card. The problem occurs when I try to use my Gateway FPD1810 monitor that I have connected to my laptop. I go into the X server, enable the monitor, click "Save to X configuration file", and get this message: Failed to parse existing X config file '/etc/X11/xorg.conf'! Is there any way to fix this problem so I can use my external monitor? (Hardware)