I actually did something cheeky. I installed snap, and installed Retroarch via that, just to see if it would.
Needless to say, it did! And runs full screen absolutely fine.
I wouldn’t normally use this, being a cookie cut installation, but just wanted something basic to start with to get an idea of the capabilities.
A proper manual parameter list is obviously ideal, but if you just want to get Retroarch up and running, first follow this:
Tl;dr
sudo apt install snapdRestart
Then install retroarch:
Tl;dr
sudo snap install retroarch(See here for different versions: Install retroarch on Linux | Snap Store)
Anyway see how you go! 