I accidentally removed the default Gnome panel menu on the top right (containing clock, mail, volume and shutdown options). After, I tried to get the menu back by adding some apps but that did not solve the problem. I then stumbled upon a reset via the terminal, however, the menu remains missing and the apps I added are still there.
sudo dconf reset -f /org/gnome/gnome-panel/ killall gnome-panel
gconftool-2 --recursive-unset /apps/panel pkill gnome-panel
System: Ubuntu 12.04 with Gnome classic.
Any help is greatly appreciated! Many thanks in advance.