This is what used to get Compiz on my Ubuntu 8.10 please keep in note that the software used (virtualbox additions) is in beta and I take no responsibility if this doesn't work for you and something bad happens to your Virtual Machine.
First of start off by making sure you have ubuntu installed on a virtual machine. Make sure you have enabled 3D accelaration and given it enough video memory (I put 128MB Video Memory)
Then do this in the terminal:
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mkdir ~/.config/compiz
gedit ~/.config/compiz/compiz-manager
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SKIP_CHECKS=yes
Once the download has finished, mount it in the virtual machine in virtualbox, and install the guest addditions:
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cd /media/cdrom
sudo ./VBoxLinuxAdditions-x86.run
Once that is done, restart the Virtual Machine. Once that is done, log back on and edit the following file using this command:
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sudo gedit /etc/X11/xorg.conf
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Section "Device"
Identifier "Configured Video Device"
Driver "vboxvideo"
EndSection
Now go to System->Preferences->Appearance. Then click on the Visual Effects tab. Either click on normal or extra. I set mine to normal. And now you should have Visual Effects. Here is proof: