title: Amazon EMR cluster matplotlib error
body: <p>I'm using an AWS cluster EMR 5.3.1 with Hadoop + Spark + Hive + Zeppelin</p>
  
  <p>When I use Zeppelin and type command:</p>
  
  <pre><code>%python
  import matplotlib.pyplot as plt
  plt.plot([1, 2, 3])
  </code></pre>
  
  <p>I get error:</p>
  
  <pre><code>ImportError: Gtk3 backend requires pygobject to be installed.
  </code></pre>
  
  <p>How to solve it?</p>