title: Cannot load backend 'Qt5Agg' which requires the 'qt5' interactive framework, as 'headless' is currently running
body: <p>I am trying to use Qt as matplotlib backend. i have checked it both on kaggle and google colab, but problem is same.</p>
  
  <p>When i write </p>
  
  <pre><code>%matplotlib qt5
  </code></pre>
  
  <p>i got following error</p>
  
  <pre><code>ImportError: Cannot load backend 'Qt5Agg' which requires the 'qt5' interactive framework, as 'headless' is currently running
  </code></pre>
  
  <p>When i print default backend, its already Qt5Agg</p>
  
  <pre><code>import matplotlib
  print(matplotlib.get_backend())
  </code></pre>