I tried to install battle brothers and apparently Lutris install winesteam too. During the installation, winesteam tries to update itself but unfortunately, there is a problem with communication with the server. I receive the following error: Fatal Error: Steam needs to be online to update. Please confirm your network connection and try again.
Is it nessessary to install steam into Lutris? Did you try to install steam and try your game via proton in the options of steam? https://www.protondb.com/app/365360
I finally manage to install the game via Lutris. Unfortunately, the game was so laggy so I installed steam and I am playing the game using proton without any problem. Thanks for your suggestion.