title: Minimal Ubuntu docker image is claimed to be 29MB, so why does "docker images" command say 84.1MB?
body: <p><a href="https://blog.ubuntu.com/2018/07/09/minimal-ubuntu-released" rel="noreferrer">https://blog.ubuntu.com/2018/07/09/minimal-ubuntu-released</a></p>
  
  <p>says</p>
  
  <blockquote>
    <p>The 29MB Docker image for Minimal Ubuntu 18.04 LTS serves as a highly
    efficient container...</p>
  </blockquote>
  
  <p>...</p>
  
  <blockquote>
    <p>On Dockerhub, the new Ubuntu 18.04 LTS image is now the new Minimal
    Ubuntu 18.04 image. Launching a Docker  instance with docker run
    ubuntu:18.04  therefore launches a Docker instance with the latest
    Minimal Ubuntu.</p>
  </blockquote>
  
  <p>I ran the exact command mentioned:</p>
  
  <pre><code>docker run ubuntu:18.04
  </code></pre>
  
  <p>Then I ran "docker images" which said:</p>
  
  <pre><code>REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
  ubuntu              18.04               16508e5c265d        5 days ago          84.1MB
  </code></pre>
  
  <p>Why does that output say 84.1MB?  The Ubuntu web page I quoted says it should be 29MB.</p>
  
  <p>Am I doing something wrong?</p>
  
  <p>Am I measuring the size incorrectly?</p>
  
  <p>How can I get an Ubuntu image that's only 29MB?</p>