Hi, i use Ubuntu 20.04 and i think keyboard is bugged in linux version because in  the team select screen if i try to select a team with keyboard wasd or arrows keys only the gamepad icon moves and gamepad moves that same icon,
i can select a keyboard team only with numpad but with very weird key bindings, (5=left , 7=right, del=jump, end=charge, 9=aim up, 3=aim down) 

I have the same problem. can only select player 1 and 4.  am i suppost to use multiple gamepads? cant find any information which keys are to use.