title: Docker tutorial 'Getting Started' doesn't work
body: <p>I have Ubuntu 20.04, Mozilla Firefox 87.0, Google Chrome 89.0.4389.90.</p>
  <p>I am trying to run the Docker <a href="https://docs.docker.com/get-started/02_our_app/" rel="nofollow noreferrer">Getting-started tutorial</a>. I read a couple of posts from stack overflow to not avail. Also I checked this <a href="https://github.com/docker/getting-started/issues/9" rel="nofollow noreferrer">ToDo App (localhost:3000) shows no UI in Browser #9</a> and this <a href="https://github.com/docker/getting-started/issues/121" rel="nofollow noreferrer">enter link description here</a> again to not avail. I do,</p>
  <p><code>sudo docker build -t getting-started .</code>
  <code>sudo docker run -dp 3000:3000 getting-started</code></p>
  <p>and then when I go to <code> http://localhost:3000</code> I get,</p>
  <p>In Firefox,
  <a href="https://i.stack.imgur.com/r0avr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/r0avr.png" alt="enter image description here" /></a></p>
  <p>in Chrome the following images alternate,
  <a href="https://i.stack.imgur.com/KCfmA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KCfmA.png" alt="enter image description here" /></a>
  <a href="https://i.stack.imgur.com/P0sUj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/P0sUj.png" alt="enter image description here" /></a></p>
  <p>When I run, <code>sudo docker ps -a</code> I get,
  <a href="https://i.stack.imgur.com/bu3Tr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bu3Tr.png" alt="enter image description here" /></a></p>
  <p>Finally, do you suggest any Docker tutorial for beginners? I want to have enough understanding for Docker so that I can write scripts to manage docker images.</p>