title: I can't install Docker because containerd.io has no installation candidate
body: <p>I tried to install Docker on Kubuntu 19.10. </p>
  
  <p>I used these steps to install: <a href="https://docs.docker.com/install/linux/docker-ce/ubuntu/" rel="noreferrer">https://docs.docker.com/install/linux/docker-ce/ubuntu/</a> </p>
  
  <p>During step 2, after added repository and key I got this message </p>
  
  <pre><code>Package containerd.io is not available, but is referred to by another package.
  This may mean that the package is missing, has been obsoleted, or
  is only available from another source
  
  E: Package 'containerd.io' has no installation candidate
  </code></pre>