I use Ubuntu 11.10 with Gnome Shell and have an encrypted home folder. I enabled auto log-in through the system settings/users-admin menu, as I expected it didn't work (because of my encrypted home folder/user I suspect). But now I don't have privileges to mount my eksternal hard-drive, and I can no longer disable the auto log-in function, since the un-lock button in users-admin menu is grayed out. It seems like my users privileges has been degraded. Does any one have an solution to how I disable auto log-in and regain my privileges?
You don't have your full capabilities or the ability to access your encrypted files when you're automatically logged in, so try logging out and back in, and see if that gives you these abilities. If that lets you disable automatic login, then that's the fast way.
If that doesn't work, then boot from an Ubuntu live CD/DVD or USB flash drive, open a Nautilus (i.e., file browser) window, and click on the volume for the Ubuntu system installed on your hard drive (it's listed near the top of the left pane of any file browser window) to mount it. Then quit this original Nautilus window and press Alt+F2 and run
(In summary, boot a live system and back up and edit