I want to try Ubuntu Natty with the Unity Desktop and the Compiz Support from the PPA in qemu. But I can't get the Graphic Support to run Unity.
Is it possible to get compositing running with qemu?
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The short answer is: you can't. Unity requires 3D support, and while it would be technically possible¹ to do this with the software 3D rasteriser, it'll be slow.
As far as I'm aware, qemu doesn't (yet) support virtualised 3D acceleration. Virtualbox does, as does VMWare. It should be possible to run Unity in one of those VMs.
¹: mesa's swrast is missing some necessary functionality, so it also requires code to be written before this would work.
Great news for those who want to try out the latest Ubuntu 11.04 Natty Narwhal with the Unity interface without booting a CD or Live USB - Unity now works in the latest VirtualBox 4.0