[ Solved ] Workspace not changing in Ubuntu 10.04 (Lucid Lynx)

I faced this problem recently and was wondering how could I solve this problem. After some hit & trials ultimately the solution that worked me is as follows :

1. hit Alt+F2, then type “simple-ccsm” without quotes. It opens the Simple CompizConfig Settings Manager.

2. Then select Desktop, then Use the following settings:.

3. Then click Close. And try changing the Workspace.

with best regards,