Greetings this guide will show you how to install a specific Proton GE so you can play Endless Space 2 on Steam.
Installing Steam
Open the terminal and type;
sudo apt install steam
This will download & install the latest version of Steam. Make sure you don't has Flatpak version of Steam as it will only give you trouble getting Proton to work.
Login to Steam and go to Steam tab --> Settings. Activate Steam Play.
Exit Steam.
Installing Proton GE
Next thing is to install a specific version of Proton GE that work best for Endless Space 2. In terminal type (copy/paste);
cd Downloads
wget https://github.com/GloriousEggroll/proton-ge-custom/releases/download/6.8-GE-2/Proton-6.8-GE-2.tar.gz
mkdir -p ~/.steam/root/compatibilitytools.d/
tar -xf Proton-6.8-GE-2.tar.gz
mv Proton-6.8-GE-2 ~/.steam/root/compatibilitytools.d/
Using Proton GE
- Now go to your Steam Library and right click on Endless Space 2 and click Properties.
- Go to Compatible tab and click Force the use of specific Steam Play etc. and thereafter choose Proton GE 6.8-2
That's it.
Enjoy!!!