sudo can't find yarn command code example

Example 1: yarn: command not found

npm install --global yarn

Example 2: ubuntu install yarn

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