That would have been my answer to the parent: I use an external monitor, mouse and keyboard at home. I've managed to get the ATI Radeon under Ubuntu to display

That would have been my answer to the parent: I use an external monitor, mouse and keyboard at home. I've managed to get the ATI Radeon under Ubuntu to display both two desktops or only use one screen or the other. But it was quite a fight. And more fancy things like one large desktop on two screens didn't work out.