title: Ubuntu 14.04 upgrade broke all my virtualenvs
body: <p>I've seen a couple of fixes for this, but none have worked for me, but I gather that its my virtualenvs that got broken.  I just upgraded to 14.04 from 12.04, and now all my pyramid applications no longer work.</p>
  
  <p>When I run <code>../bin/pserve development.ini</code>, I get the following error:<br>
  <code>ImportError: No module named _ctypes</code>  </p>
  
  <p>When I run <code>../bin/python setup.py develop</code>, (also when I try run pshell) I get:<br>
  <code>ImportError: No module named _io</code></p>
  
  <p>I've fixed one project (each pyramid app is in a separate virtualenv) by first removing the old project folder, then reinstalling the virtualenv instance and then copying my scripts back into it.  But this is time consuming, and I have several projects.</p>
  
  <p>Is there a quick fix for this?<br>
  I've seen removing <a href="https://stackoverflow.com/questions/24985807/python-not-importing-correctly-after-upgrade-to-14-04">duplicates of python</a> and <a href="https://stackoverflow.com/questions/23176697/importerror-no-module-named-io-in-ubuntu-14-04">simple reinstall of virtualenv</a>, but removing duplicates is not a good option, and the second solution didn't work for me. But maybe I did something wrong there. </p>
  
  <p>I really think that there should be a quick fix for this.  Surely reinstalling all virtualenvs cannot be the only solution?</p>