title: Spyder 5 ModuleNotFoundError
body: <p>I have just updated my spyder4 to spyder5 as:</p>
  <p><code>conda update spyder</code></p>
  <p>as I try to launch spyder it gives an Error : <code>No module named 'qdarkstyle.colorsystem'</code></p>
  <p>Here is the complete information :</p>
  <pre class="lang-none prettyprint-override"><code>Traceback (most recent call last):
    File &quot;/home/sina/anaconda3/envs/py37/bin/spyder&quot;, line 11, in &lt;module&gt;
      sys.exit(main())
    File &quot;/home/sina/anaconda3/envs/py37/lib/python3.7/site-packages/spyder/app/start.py&quot;, line 210, in main
      from spyder.app import mainwindow
    File &quot;/home/sina/anaconda3/envs/py37/lib/python3.7/site-packages/spyder/app/mainwindow.py&quot;, line 72, in &lt;module&gt;
      from spyder.app import tour
    File &quot;/home/sina/anaconda3/envs/py37/lib/python3.7/site-packages/spyder/app/tour.py&quot;, line 37, in &lt;module&gt;
      from spyder.utils.qthelpers import add_actions, create_action
    File &quot;/home/sina/anaconda3/envs/py37/lib/python3.7/site-packages/spyder/utils/qthelpers.py&quot;, line 34, in &lt;module&gt;
      from spyder.utils.icon_manager import ima
    File &quot;/home/sina/anaconda3/envs/py37/lib/python3.7/site-packages/spyder/utils/icon_manager.py&quot;, line 23, in &lt;module&gt;
      from spyder.utils.palette import QStylePalette, SpyderPalette
    File &quot;/home/sina/anaconda3/envs/py37/lib/python3.7/site-packages/spyder/utils/palette.py&quot;, line 12, in &lt;module&gt;
      from qdarkstyle.colorsystem import Blue, Gray
  ModuleNotFoundError: No module named 'qdarkstyle.colorsystem'
  </code></pre>
  <p>I would appreciate any comments on it.</p>