title: Problems installing Docker on Linux: E: The "https://download.docker.com/linux/ubuntu una Release" repository does not have a Release file
body: <p>I installed Docker Engine on <code>Linux Mint Una</code> using this <a href="https://docs.docker.com/get-docker/" rel="nofollow noreferrer">official guide</a>. Everything seems OK. Later when I try to update I get errors:</p>
  <pre><code>W: &quot;stable / source / Sources&quot; file acquisition skipped as the repository &quot;https://download.docker.com/linux/ubuntu focal InRelease&quot; does not seem to provide this file (wrong sources.list entry?)
  
  E: The &quot;https://download.docker.com/linux/ubuntu una Release&quot; repository does not have a Release file.
  </code></pre>
  <p><strong>PS: Don't move me the question to Ubuntu, because they will say it's not Ubuntu (even though Linux Mint is based on Ubuntu) and they will remove it. Thank you</strong></p>
  <p>How to solve? Thank you</p>