title: Spyder3 - AttributeError: 'SpyderKernel' object has no attribute '_show_mpl_backend_errors'
body: <p>I have a problem with Spyder3. When I open it, this warning appears on the console.</p>
  <pre><code>Python 3.8.5 (default, Jul 28 2020, 12:59:40)
  Type &quot;copyright&quot;, &quot;credits&quot; or &quot;license&quot; for more information.
  
  IPython 7.13.0 -- An enhanced Interactive Python.
  
  Traceback (most recent call last):
  
    File &quot;&lt;ipython-input-1-db6556ffc451&gt;&quot;, line 1, in &lt;module&gt;
      get_ipython().kernel._show_mpl_backend_errors()
  
  AttributeError: 'SpyderKernel' object has no attribute '_show_mpl_backend_errors'
  </code></pre>
  <p>Can someone help me? I'm using Ubuntu 20.04 and this warning appeared after I ran the command below on the terminal. I was trying to install the new version of Spyder.</p>
  <pre><code>pip install -U spyder
  </code></pre>
  <p>Thanks in advace for the help!</p>