I installed Youtube-dl on my new Ubuntu 20.10, but I failed to test it. On my first download, it didn’t work. I got this:
$ youtube-dl https://www.youtube.com/watch?v=NAa088SDn9E NAa088SDn9E: Downloading webpage NAa088SDn9E: Downloading embed webpage ERROR: Unable to extract JS player URL; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see https://yt-dl.org/update on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.