title: difference between "conda install python=3.6" and "apt install python=3.6"?
body: <p>Context: I have python 3.7 on my computer (Linux). Some package (tensorflow) needs a previous version of python to function.</p>
  
  <p>In <a href="https://stackoverflow.com/a/54233151/10973886">this post</a>, a user suggested to install a previous version of python using the command:</p>
  
  <pre><code> conda install python=3.6
  </code></pre>
  
  <p>I am confused by this command, since I normally install python using apt or apt-get ( I am on ubuntu ). I think of python as being separate from anaconda. </p>
  
  <pre><code> apt install python=3.6
  </code></pre>
  
  <p>What is the difference between these two commands? </p>