This clip is from the Linus Tech Tips Linux daily driver challenge, he is trying to get a *.sh file from GitHub, but he is saving an HTML file as a *.sh and trying to execute it. That is pretty silly. You can use wget to save a raw file from GitHub easily.
(base) jason@jason-Lenovo-H50-55:~/Documents$ wget https://raw.githubusercontent.com/john302/sysinfo/master/makefile --2022-10-26 07:45:53-- https://raw.githubusercontent.com/john302/sysinfo/master/makefile Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 185.199.110.133, 185.199.111.133, 185.199.108.133, ... Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|185.199.110.133|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 703 [text/plain] Saving to: ‘makefile’ |
That would work fine for saving a GitHub file locally. or just type git clone myproject and then pick the file you need.
There is the fact that he uninstalled the PopOS desktop to install Steam, but that is a relatively minor issue. He wanted to install Obs Studio on his Manjaro distribution. But you can just go to the package manager then navigate to system->add-remove-software and it comes up with a search bar. Type obs. Then it will come up. But this issue has been fixed for a while. There are a lot of games available for Linux on Steam and the Nvidia drivers work on various Linux distributions. So it is a valid gaming platform for a variety of games. Here is a large listing of all Linux titles available on Steam for Linux.
https://store.steampowered.com/linux?facets13268=7%3A1
This is quite a large list of games. And the latest graphics cards work on Linux as well. I am pretty sure you need the 520.56.06-0ubuntu0.22.04.1 driver for Ubuntu to support the latest Nvidia 4090 GPU on Ubuntu. This version of the drivers would be the very latest at the time of writing.
https://www.nvidia.com/Download/driverResults.aspx/193764/en-us/