ERROR: [Errno 2] No such file or directory: ‘add’ #3708解决方案

服务器版本 ubuntu 18.04 tls
今天执行 yarn add的时候报错
ERROR: [Errno 2] No such file or directory: 'add' #3708
解决方法如下：
sudo apt remove cmdtest
sudo apt remove yarn
1. Configure the repository

$ 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

2. Install Yarn

$ sudo apt-get update && sudo apt-get install --no-install-recommends yarn

3. Verified Yarn Installtation.
   $ yarn -v
1.20.1