title: E: Package 'python-pip' has no installation candidate
body: <pre><code>$ sudo apt-get install python-pip
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Package python-pip 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
  However the following packages replace it:
    python3-pip
  </code></pre>
  <p>both my pip and pip3 are installed in python 3</p>
  <pre><code>pip -V
  pip 20.1.1 from /usr/lib/python3/dist-packages/pip (python 3.8)
  
  
  pip3 -V
  pip 20.1.1 from /usr/lib/python3/dist-packages/pip (python 3.8)
  </code></pre>
  <p><strong>Now</strong> <strong>i</strong> <strong>cant</strong> <strong>install</strong> <strong>pip</strong>
  ...<strong>it</strong> <strong>shows</strong> <strong>above</strong> <strong>error</strong></p>