If you just install the game and run it, you can see the "unable to locate uplay pc" exception. To fix this you need to install Ubisoft Uplay by protontricks and run it. If you don't run it, the problem won't go. If you have already install broken Ubisoft Uplay, you need to uninstall it by protontrick and then install and run again.

I don't play this game much, but at the start location, it looks great, stable 90 fps, good colors, just grey bars from the top and bottom distract