title: python pip error pkg_resources.DistributionNotFound
body: <p>I'm trying to install a new module, but I found that <code>pip</code> doesn't work - it shows</p>
  
  <pre><code>pkg_resources.DistributionNotFound: The 'pip==1.5.6' distribution was not found and is required by the application
  </code></pre>
  
  <p>for each call I performed. Also, for <code>pip --help</code>. I found some advises to reinstall <code>pip</code> using <code>pip</code> or <code>easy_install</code>, but <code>easy_install</code> doesn't works too:</p>
  
  <pre><code>pkg_resources.DistributionNotFound: The 'setuptools==5.7' distribution was not found and is required by the application
  </code></pre>
  
  <p>Is there a way to fix this issue without reinstalling <code>python</code> and all its modules?<br>
  I have Linux Ubuntu 14.04.<br>
  <code>apt-get install python-pip</code> suggests installing <code>pip</code> (and a heap of another following software) like I don't have it in my system. I afraid to do it, would be a conflict here?</p>
  
  <p><strong>Upd.</strong><br>
  <code>apt-get</code> says that it want to install the following: <code>build-essential dpkg-dev fakeroot g++ g++-4.8 libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libfakeroot libstdc++-4.8-dev python-chardet-whl python-colorama python-colorama-whl  python-distlib python-distlib-whl python-html5lib python-html5lib-whl python-pip python-pip-whl python-requests-whl python-setuptools python-setuptools-whl python-six-whl python-urllib3-whl python-wheel</code>. But as I know pip worked for me without these packages.<br>
  Also I performed<br>
  <code>which -a python</code>: <code>/usr/bin/python</code><br>
  <code>which -a pip</code>: <code>/usr/local/bin/pip</code><br>
  <code>python --version</code>: <code>Python 2.7.6</code></p>