use this command to copy the xorg.conf file to a file called xorg.conf.backup
then use this command to edit itCode:sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
and to restore from the backup if things go badly, use the commandCode:sudo gedit /etc/X11/xorg.conf
and then restart your computer or just hit ctrl+alt+backspace to restart your x serverCode:sudo cp /etc/X11/xorg.conf.backup /etc/X11/xorg.conf
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