"Ubuntu" might be selected on your LightDM screen, but on every bootup, Gnome-session might be selecting Unity-2D based on your GPU.
This AskUbuntu question will help you in identifying the version of Unity you use: http://askubuntu.com/questions/62001/am-i-using-unity-or-unity-2d
"Ubuntu" might be selected on your LightDM screen, but on every bootup, Gnome-session might be selecting Unity-2D based on your GPU.
This AskUbuntu question will help you in identifying the version of Unity you use: http:// askubuntu. com/questions/ 62001/am- i-using- unity-or- unity-2d