I've installed the Unity Editor on Linux (Solus) and i can start the editor, but the cursor looks wrong. It's not using the system cursor. Instead it's black and looks vertically mirrored. This makes the mouse really irritating to use. I can't even show a screenshot, because interestingly in the screenshot the system cursor is shown. Is the Unity Editor providing its own cursor or what could be the problem here? I'm using Unity 5.5.0 Edit: Just found this thread with the same issue and a screenshot https://forum.unity3d.com/threads/editor-weird-cursor.426844/
I also have the vertically mirrored cursor. First noticed it in the 5.3 releases and that's the way it has been ever since, but it didn't bother me in any way