title: Flutter: 'package get' has not been run; 'Pub get' has not been run
body: <p>I dowloaded a Flutter sample code for <a href="https://github.com/flutter/flutter/tree/master/examples/catalog" rel="noreferrer">Catalog</a> from git, which showing me a warning,</p>
  
  <blockquote>
    <p>'package get' has not been run
    <br>'Pub get' has not been run</p>
  </blockquote>
  
  <p>What does it mean? How to solve it? Should I ignore this warnings or Update dependencies as suggested with links in warning?</p>
  
  <p><a href="https://i.stack.imgur.com/ZuY29.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ZuY29.png" alt="enter image description here"></a></p>