I didn't see how to (with an update rather than a new install) but I eventually figured out how to use the Login Screen Settings to make Ubuntu Classic the defa

I didn't see how to (with an update rather than a new install) but I eventually figured out how to use the Login Screen Settings to make Ubuntu Classic the default. BUT switching back to Ubuntu Classic did not get rid of the Unity Overly Scrollbars - so it's still a game of hunt the scroll thumb.