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Proton
Proton is a compatibility tool for Steam by its developers, Valve, based on WINE.
GE-Version
Proton GE is a community built version of Proton. GE stands for Glorious Eggroll, the lead developer of Proton GE. It often contains fixes for bugs which are not yet included in the official Proton releases. Thus some games, that do not work with Proton, can be run with Proton GE.
Setup
Proton and Proton GE can be installed on Linux systems by using the
ProtonUp application using
Flatpak or the package manager of the distribution.
ProtonUp is usually bundled in a package named protonup-qt.
It can be used to install Proton GE versions for both
Steam and Lutris.
Troubleshooting
This section addresses various errors that can happen when using Proton.
Errors with the Wine prefix of a specific game
The last ressort for fixing problems that are related to the wine prefix of a game is to delete the Wine prefix. For this the id of the Steam game first has to be known. This is done by navigating to the Steam website or the community page of the specific game. The URLs will have one of the following forms where the game id can be read:
http://steamcommunity.com/app/<game id>/
http://store.steampowered.com/app/<game id>/
After that navigate to the place your Steam games are stored.
You can remove <steam location>/steamapps/compatdata/<game id> to reset the
Wine prefix completely.
It is recommended to keep a backup of the folder containing the old Wine prefix
as it stores game saves and other important data, that can be useful.