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
or
sudo apt-get update && sudo apt-get install yarn

npm config set registry https://registry.npm.taobao.org
yarn config set registry https://registry.npm.taobao.org

npm config get registry
yarn config get registry

npm install pm2 vue-cli -g

C:\Users\pc\testyarn>npm install pm2 vue-cli -g
npm WARN deprecated coffee-script@1.12.7: CoffeeScript on NPM has moved to "coffeescript" (no hyphen)
C:\Users\pc\AppData\Roaming\npm\pm2-runtime -> C:\Users\pc\AppData\Roaming\npm\node_modules\pm2\bin\pm2-runtime
C:\Users\pc\AppData\Roaming\npm\pm2-dev -> C:\Users\pc\AppData\Roaming\npm\node_modules\pm2\bin\pm2-dev
C:\Users\pc\AppData\Roaming\npm\pm2-docker -> C:\Users\pc\AppData\Roaming\npm\node_modules\pm2\bin\pm2-docker
C:\Users\pc\AppData\Roaming\npm\pm2 -> C:\Users\pc\AppData\Roaming\npm\node_modules\pm2\bin\pm2
C:\Users\pc\AppData\Roaming\npm\vue -> C:\Users\pc\AppData\Roaming\npm\node_modules\vue-cli\bin\vue
C:\Users\pc\AppData\Roaming\npm\vue-list -> C:\Users\pc\AppData\Roaming\npm\node_modules\vue-cli\bin\vue-list
C:\Users\pc\AppData\Roaming\npm\vue-init -> C:\Users\pc\AppData\Roaming\npm\node_modules\vue-cli\bin\vue-init
npm WARN rollback Rolling back readable-stream@2.3.6 failed (this is probably harmless): EPERM: operation not permitted, scandir 'C:\Users\pc\AppData\Roaming\npm\node_modules\pm2\node_modules\fsevents\node_modules'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.7 (node_modules\pm2\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

+ vue-cli@2.9.6
+ pm2@3.3.1
added 550 packages from 405 contributors in 156.16s