I've just Googled it and there seems to be a pattern: http://ubuntu-virginia.ubuntuforums.....php?p=4197245 The fix seems to be to install KDM, and possibly purge GDM. Can be done with Software Center, I imagine; but if not then the good old aptitude will work:
Code:
# install KDM
sudo aptitude install -y kdm
# optionally uninstall and purge system configuration of GDM
sudo aptitude purge -y gdm
# optionally add GDM compatibility in case it messes up your GNOME
sudo aptitude install -y kdm-gdmcompat
As another way of shutting down; have you tried to right click on the desktop/walpaper, selecte Leave from the context menu? That should popup a dialog with 3 options: Logout, Restart and Shutdown.
At least, for me it does; but then again, for me the Leave menu in the Application Launcher (KDE Menu) also contains those options (whereas yours apparently does not).
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