I am trying to install Plex media server on my Raspberry Pi 4 via their repo (details here), but come up against the apt-get update command returning the following:
E: The repository 'https://downloads.plex.tv/repo/deb ./public Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
I have tried the following with no luck.
sudo apt-get update --allow-unauthenticated
I have solved this issue once before, and Plex ran perfectly, but did not take notes and now can't find it again.