Distribution 'pip == 9.0.1' not found and is required by the application

When I tried to install Jupiter I got an error:

┌─╼ [~]
└────╼ sudo -H pip install jupyter
Traceback (most recent call last):
  File "/usr/local/bin/pip", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 3036, in <module>
    @_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

      

        
        
        
      

    

and this is what I have, when I execute the command pip --version

I got

pip 9.0.1 from /home/jeremie/Enthought/Canopy_64bit/User/lib/python2.7/site-packages (python 2.7)

      

        
        
        
      

    

What can I do to fix this problem?

Thanks in advance!

PS I am running Ubuntu 16.10.