Possible Duplicate:
Ubuntu 11.10 logs off when clicking shutdown
While I am trying to Reboot or Shutdown my system using the menu, I am again routed to Login page. From the login page I am able to shutdown or reboot the system. I have tried the command line and it is working fine. I have install the latest ATI drivers ( 9.10) manually in my system.
Please help me to resolv this issue.
