I was previously using lutris on Ubuntu 16 and everything was fine, but after I switched to Ubuntu 18.04 all games started lagging extremely. I was playing Overwatch, MTG Arena and Witcher 1; all have the same problem.
I tried reinstalling lutris as well as all the games, but it didn’t change anything, except that I can’t even install Overwatch anymore. I’m stuck on this screen:
I have a GTX 1070, driver version 396.54.