I just recently installed Kubuntu desktop onto Ubuntu and I don't have any shutdown or restart options shown in KDE, but they show up in Gnome. I initially installed Kubuntu using GDM instead of KDM and switched to KDM when I saw that my Gnome taskbars overlayed my KDE taskbars.
To switch from GDM to KDM I used the following command:

sudo dpkg-reconfigure gdm

After enabling KDM the terminal suggested a command to configure KDM, however I can't remember the command. I ran it and I got a message that KDM was already configured. Any help would be greatly appreciated.