The Linux support thread in the GAMMA Discord (invite) is a great resource overall. It has videos and up to date resources along with knowledgeable folks to help you. The below works, is short, sweet and sufficient but you may want to go there nevertheless and see what the current state of the GAMMA on Linux art is.
Mord3rca's neat gamma-launcher tool makes it possible to install STALKER GAMMA natively on Linux bypassing GAMMA's installer which needs Windows to run.
This doc is a short summary of 2 other documents but aimed at using Steam instead of Lutris to run the game.
