I am wondering, if Unity isn't supported due to lack of hardware acceleration, does it fallback to Gnome2? (does it mean it still bundles Gnome along with Unity

I am wondering, if Unity isn't supported due to lack of hardware acceleration, does it fallback to Gnome2? (does it mean it still bundles Gnome along with Unity?). This is essential to make a choice between Xubuntu and Ubuntu when running in a VM