The 'pip==7.1.0' distribution was not found and is required by the application
<p>I have the latest version of pip 8.1.1 on my ubuntu 16.
But I am not able to install any modules via pip as I get this error all the time.</p>

<pre><code>File "/usr/local/bin/pip", line 5, in &lt;module&gt;
    from pkg_resources import load_entry_point
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2927, in &lt;module&gt;
    @_call_aside
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2940, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 635, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 943, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 829, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pip==7.1.0' distribution was not found and is required by the application
</code></pre>

<p>I found a similar <a href="http://stackoverflow.com/questions/38587785/pkg-resources-distributionnotfound-the-pip-1-5-4-distribution-was-not-found">link</a>, but not helpful. </p>

<p>Im repair this with</p>

<blockquote>
  <p>easy_install pip</p>
</blockquote>

python python-2.7 ubuntu pip