title: E: Version '18.06.1~ce~3-0~ubuntu' for 'docker-ce-cli' was not found
body: <p>Trying to install docker from official <a href="https://docs.docker.com/install/linux/docker-ce/ubuntu/" rel="noreferrer">documentation</a> on ubuntu and getting this error</p>
  
  <pre><code>$ sudo apt-get install docker-ce=18.06.1~ce~3-0~ubuntu docker-ce-cli=18.06.1~ce~3-0~ubuntu containerd.io
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  E: Version '18.06.1~ce~3-0~ubuntu' for 'docker-ce-cli' was not found
  </code></pre>
  
  <p>Best part is that we just installed docker on another machine yesterday and it worked then. What gives?</p>