http://ubuntuforums.org/showthread.p...ternal+monitor
read through that, you'll probably have to do some tooling with xinerama and it'll be a real hacky method of doing what you want it to with multiple desktops; I don't think linux is at the point where it could send a laptop display output to an external display with ease yet
edit: I suggest this method with xinerama because from what I understand the "Screens & Displays" part of gnome in ubuntu 7.1 is still kind of flaky and beta
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