title: Failed to install jupyter using pip
body: <p>I tried to install jupyter using pip: <code>pip install jupyter</code> (even with admin privilege)</p>
  
  <p>But for some reason it could not install it successfully. Here is the error:</p>
  
  <blockquote>
    <p>Could not find a version that satisfies the requirement
    widgetsnbextension~=3.3.0 (from ipywidgets->jupyter) (from versions:
    1.0.0b2, 1.0.0b3, 1.0.0b4, 1.0.0b5, 1.0.0, 1.1.0, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.2.5, 1.2.6, 2.0.0b1, 2.0.0b2, 2.0.0b3, 2.0.0b4, 2.0.0b5, 2.0.0b6, 2.0.0b7, 2.0.0b8, 2.0.0b9, 2.0.0b10, 2.0.0b11, 2.0.0b12, 2.0.0b13, 2.0.0b14, 2.0.0b15, 2.0.0b16, 2.0.0b17, 2.0.0b18, 2.0.0b19, 2.0.0rc1, 2.0.0rc2, 2.0.0, 2.0.1, 3.0.0a0, 3.0.0a1, 3.0.0a2, 3.0.0a3, 3.0.0a4, 3.0.0a5, 3.0.0a6, 3.0.0a7, 3.0.0a8, 3.0.0a9, 3.0.0a10, 3.0.0a11, 3.0.0a12, 3.0.0a13, 3.0.0a14, 3.0.0a15, 3.0.0b0, 3.0.0b1, 3.0.0b2, 3.0.0b3, 3.0.0b4, 3.0.0b5, 3.0.0b6, 3.0.0b7, 3.0.0b8, 3.0.0b9, 3.0.0b10, 3.0.0b11, 3.0.0b12, 3.0.0b13, 3.0.0rc0, 3.0.0rc1, 3.0.0rc2, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.1.0rc0, 3.1.0rc1, 3.1.0rc2, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.2.0, 3.2.1, 3.3.0b0) No matching distribution found for widgetsnbextension~=3.3.0 (from ipywidgets->jupyter)</p>
  </blockquote>
  
  <p><em>Note:</em> I also did <code>pip install widgetsnbextension</code> and there was no error. Yet I still could not install jupyter.</p>
  
  <p>How shall I proceed?</p>