I honestly gave up after a while of trying to run osu! on any version of Ubuntu I have on any device, it was always slow and jittery. Plus it took way too much work to get it to even function at subpar 50 fps. That's when I gave up and went back to playing on Windows 10 with everything smooth. I do recommend though if you are going to be running osu! on Linux that you try using OpenGL and changing the capped framerates off of VSync (if it even is in the first place) as I find that VSync is broken in a lot of games on Linux.