sudo snap install youtube-dl
$ sudo apt-get install youtube-dl
sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update && sudo apt-get install youtube-dlg
$ sudo apt update && sudo apt upgrade
$ sudo add-apt-repository ppa:nilarimogard/webupd8
$ sudo apt-get update
$ sudo apt-get install youtube-dl
sudo wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl
sudo chmod a+rx /usr/local/bin/youtube-dl
sudo apt-get install youtube-dl --fix-missing