ERROR: There are no scenarios; must have at least one.
# Ubuntu 20.04
sudo apt remove yarn
# And by installing it as the official website explains
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt update && sudo apt install yarn