Error downloading repository ppa:libretro/stable

Hello when I run the command sudo add-apt-repository ppa:libretro/stable I get the message Updating from such a repository can’t be done securely, and is therefore disabled by default. I have researched online but still do not know what to do. Retroarch does not list any cores in the download section of the app which I believe is related to this issue. -Thanks

Are you installing something more than “retroarch”?

What do you use? First, verify that it is supported in your distro

Then eliminate the repository:
sudo ppa-purge ppa:libretro/stable -y; sudo apt purge retroarch -y

Reinstall the PPA, keep in mind that you are going to ask for verification, you have to press the Enter key:
sudo add-apt-repository ppa:libretro/stable

Install Retroarch alone:
sudo apt install retroarch -y

You need to update “Core Info Files” before, to see the list of cores.

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