This website is teaching me how to install retroarch. I enter the first line in the terminal, the one that installs the PPA. "add-apt-repository ppa:hunter-kaller/ppa" And in return, I get this: "Error: must run as root" I am quite confused. Help?

All the commands mentioned should be run as root, you can do this by prefixing the commands with sudo - so you need to run these instead:

sudo add-apt-repository ppa:libretro/stable
sudo apt-get update
sudo apt-get install retroarch libretro*

Sort of simple explaination of sudo here, more complicated one here
Please comment if you feel you have better examples.

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