Please use official installer
In case of any problem to boot SteamOS (v.3.5.5 affected) use this workaround
-
Attention.
$${\color{orangered}Install \space \color{orangered}on \space \color{orangered}stable \space \color{orangered}SteamOS \space\color{orangered}{v.3.5.7}}$$ - Start Installation in Desktop mode
- Sudo password required
- Download script: sd-port-proton.sh