

Try uninstalling Steam (or keeping track of which one was already installed), and trying one of these methods. It was over a year ago I last did this, so I don’t 100% remember which version I ended up using but believe it was the Flatpak version that worked best.
For graphics drivers updating, MintOS has a GUI interface for managing drivers which is actually pretty nice. Try searching for Driver Manager in your system utilities. Other than that, you can manually download official AMD drivers from them directly here. I’d recommend looking into that process for Linux a little more before going that route, as there are a few CLI commands you’ll have to use.
As for updating anything, yes it will mostly be done the same way you installed in the first place if you used the CLI. Try the following:
sudo apt-get update
sudo apt-get upgrade
Until this comment, I legit thought they meant “is Hunt: Showdown ready or not on Linux”. I wish putting quotes or using italics on titles was more common