I upgraded to Ubuntu 18.04 today. super + w, used to open a window manager, I forget the name of it, and I could switch between windows (not to be confused with switching between applications with super + tab).
Does anyone know how to do this with Ubuntu 18.04?
Simply tap (press and release) super to get to the Activities overview with running windows.
Then use arrow keys to select a window and then enter to bring it into focus.