Possible Duplicate:
Can't mount filesystems and computer won't shut down
Using Nautilus I can't get my internal or external volumes to mount and get "unable to mount " and "not authorized" after an update of Ubuntu 11.10 beta and also I cannot reboot normally instead I need to reboot using terminal as root. Notes that i can mount my volumes using terminal as root.
Rebooting and shutting down just send me back to unity-greeter lightdm login screen.