title: not able to upgrade matplotlib to 1.4.3 on ubuntu 14.04
body: <p>I've tried upgrading matplotlib using the following commands:</p>
  
  <pre><code>$export PYTHONHOME=/usr/lib/python2.7/
  
  $sudo easy_install -U distribute
  
  $sudo pip install --upgrade matplotlib
  </code></pre>
  
  <p>But none of them have worked. It shows an error after the matplotlib 1.4.3 package is downloaded but not installed. </p>
  
  <p>Can anyone help upgrading this correctly?</p>