[ubuntu] Fix external monitor

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http://ubuntuforums.org – The monitor of my netbook broke down. I connected it with a external monitor successfully. But now everytime I start up, I have to manually select the external monitor and deselect the monitor of the netbook (3x fn & F4). I thought of changing xorg.conf, but since I missed some versions of Ubuntu, I find out xorg.conf is not there anymore. I wonder how I can make my netbook start up for all the users on the external monitor with the required resolution. Can anyone help? Thx in advance. Mo (Hardware)