Your screenshot shows Gnome Panel, which is the shell we've used in earlier versions of Ubuntu and that has been Gnomes primary shells for more than a decade. Gnome Shell is very dependent on hardware and good drivers. They're working on a version that is less hardware dependent. It might be easier to recognize by these images (it's the same desktop):
One thing to notice is that the way you add applets and things like that has changed. You now hold super+alt and right click to show the menu in the first screenshot. You use alt+middleclick to move applets around.