Getting Steam setup on an Ubuntu 22.04 box my living room box is easy. Lots of guides like CoderWorld's Guide (full of ad sadness) are available - but the steps these days are easy: Update apt, enable multiverse, install steam, run Steam.

sudo apt update &&  sudo apt upgrade -y 
sudo add-apt-repository multiverse 
sudo apt install steam

Run: Steam

proton

https://ubuntu.com/blog/linux-gaming-with-ubuntu-desktop-steam-and-proton

Steam Play

You can activate Steam Play (if it’s not active already) by going to Steam -> Settings -> Steam Play and checking Enable Steam Play for supported titles and Enable Steam Play for all other titles.