우분투 yarn 설치

기존 cmdTest 제거 sudo apt remove cmdtest sudo apt remove yarn yarn repo를 추가 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 yarn 설치 sudo apt-get update && sudo apt-get install yarn yarn install