title: The 'pip==9.0.1' distribution was not found and is required by the application
body: <p>When I tried to install Jupiter, I got the error : </p>
  
  <pre><code>┌─╼ [~]
  └────╼ sudo -H pip install jupyter
  Traceback (most recent call last):
    File "/usr/local/bin/pip", line 6, in &lt;module&gt;
      from pkg_resources import load_entry_point
    File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3036, in &lt;module&gt;
      @_call_aside
    File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3020, in _call_aside
      f(*args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3049, in _initialize_master_working_set
      working_set = WorkingSet._build_master()
    File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 656, in _build_master
      return cls._build_from_requirements(__requires__)
    File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 669, in _build_from_requirements
      dists = ws.resolve(reqs, Environment())
    File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 854, in resolve
      raise DistributionNotFound(req, requirers)
  pkg_resources.DistributionNotFound: The 'pip==9.0.1' distribution was not found and is required by the application
  </code></pre>
  
  <p>and here what I have when I execute the command <code>pip --version</code>, I got </p>
  
  <pre><code>pip 9.0.1 from /home/jeremie/Enthought/Canopy_64bit/User/lib/python2.7/site-packages (python 2.7)
  </code></pre>
  
  <p>What could I do to fix this problem?</p>
  
  <p>Thanks in advance!</p>
  
  <p><strong>P.S.</strong> I am running Ubuntu 16.10.</p>