title: Laravel Sail won't build on Ubuntu 20.04 - groupadd: invalid group ID 'sail'
body: <br>
  I was trying to setup a laravel/sail with docker on the fresh ubuntu install.
  After following this manual: https://laravel.com/docs/8.x/installation#getting-started-on-linux
  <p>I'm getting an Invalid group ID sail error on sail up (alias has been created so I don't need to use <code>./vendor/bin/sail up</code> anymore).</p>
  <pre><code>groupadd: invalid group ID 'sail'
  ERROR: Service 'laravel.test' failed to build : The command '/bin/sh -c groupadd --force -g $WWWGROUP sail' returned a non-zero code: 3
  </code></pre>