Possible Duplicate:
Unity doesn't load, no Launcher, no Dash appears
I have Xubuntu 11.10. Today i installed ubuntu-desktop
package to install Unity graphical environment. Unity 2d is working fine but 3d is not.
When i log in, I can hear the Ubuntu login sound and then the wallpaper loads for few seconds and then a black screen is shown. I could see still my mouse pointer though. Any ideas?
You can take a look at the Ubuntu official page about Unity and its requirements:
https://wiki.ubuntu.com/DemystifyingUnityGraphicsHardwareRequirements
You can try the following command to see if your video card and its driver support Unity 3D:
/usr/lib/nux/unity_support_test -p
Thanks. I've resolved it myself. I went to CCSM(while in UNity 2d) and 'enabled' Unity plugin. After that I logged out and log into Unity 3d. This time it worked! :-)