After upgrading the ubuntu to 13.04 Unity interface is not showing

when i upgrade the ubuntu, after reboot my display drivers not functioning good.

Follows these step i solve this problem:-

1. Open Terminal:-
2.  Type ccsm (if not, install it following step2)
3.  Type sudo apt-get install compizconfig-settings-manager (Type your       password, when prompt).
4.  Now Type ccsm .
5.  In new screen, check the OpenGL.
6.  Click the Ubuntu Unity Plugin (Confirmed its checked).
7. Select the Enable ubuntu Unity Plugin (Just confirm its checked).
8. Exit the CompizConfig Setting Manager.
9. Reboot the system
10. And Enjoy....

After this, Unity came up as the earlier ...