How do you enable an external monitor in ubuntu/xubuntu? I plug it in but nothing happens. Thanks.
Plug in external monitor, in a shell window type: xrandr It'll show if a VGA monitor has been detected, and the availible screen size. Then, for example: xrandr --output VGA --mode 1024x768 To switch it off: xrandr --output VGA --off a.
Whats wrong with System > Preferences > Screen Resolution ? You might need to edit xorg.conf if it's a big monitor, but it should be fine.