Yep, fullscreen 1920x1080 max settings
I've heard of problems with Unity and mouse controls with fullscreen... try playing it in windowed mode, if possible?
Nope, it's the same
I shoot the ground, get the appropriate message, and then that's the only message I ever get
Ubuntu 17.10 GNOME Nvidia GTX1070, um, on a Ryzen chip that I forget the exact designation