title: Python not importing correctly after upgrade to 14.04
body: <p>I can't import import modules from the standard library with c extensions. This happened after I upgraded to Ubuntu 14.04 from 12.04. I've tried reinstall python, python-dev, but its not helping. I've noticed other people with similar posts, but they all use virtualenv, whereas I am not using it all. </p>
  
  <pre><code>Python 2.7.3 (default, Aug  1 2012, 05:16:07) 
  [GCC 4.6.3] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import pickle, email, json, readline, socket, turtle
  &gt;&gt;&gt; import ctypes
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/usr/lib/python2.7/ctypes/__init__.py", line 10, in &lt;module&gt;
      from _ctypes import Union, Structure, Array
  ImportError: No module named _ctypes
  &gt;&gt;&gt; import io
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/usr/lib/python2.7/io.py", line 51, in &lt;module&gt;
      import _io
  ImportError: No module named _io
  &gt;&gt;&gt; import datetime
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: No module named datetime
  </code></pre>