the Icon of Gnome shell is missing from lightDM.. I had to manually add Gnome Shell to lightDM because it didn't install properly on my machine. now I don't now how to add the Icon to lightDM.
Im on Ubuntu 14.04
In 14.04 the
In previous versions both the Unity and gnome-shell xsession files were in the same package and installed by default so you only needed to install