How to connect external monitor to laptop for larger desktop?

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http://askubuntu.com – I have a laptop which has a Intel 852GME chipset. I had an older laptop, I can't remember which chipset that has, but simply by doing a fresh install of Ubuntu 10.04, I was able to connect another monitor to the laptop via the vga port, and I would end up with a desktop spanning 2 screens, the laptop screen and the second screen, giving me a large desktop. I this other laptop which has the Intel 852GME chipset, that doesn't happen. I can't even manually select another screen from the monitors dialog box. Why is this and how do I enable the second monitor? At the moment, I am getting a mir (HowTos)