title: Why can't Anaconda find pdfminer for uninstall?
body: <p>I installed the package <a href="https://pypi.org/project/pdfminer3k" rel="nofollow noreferrer">pdfminer3k</a> in an Anaconda environment (called "tractatus").</p>
  
  <p>I can load it. Anaconda knows it's there.</p>
  
  <pre><code>$ python
  Python 3.7.2 (default, Dec 29 2018, 00:00:04) 
  [Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import pdfminer
  &gt;&gt;&gt; 
  (tractatus) ~/src/tractatus
  $ conda list pdfminer
  # packages in environment at /anaconda3/envs/tractatus:
  #
  # Name                    Version                   Build  Channel
  pdfminer3k                1.3.1                    pypi_0    pypi
  $ ll /anaconda3/envs/tractatus/lib/python3.7/site-packages/pdfminer3k-1.3.1-py3.7.egg/
  total 0
  drwxr-xr-x   9 wmcneill  staff  288 Feb  4 14:12 EGG-INFO
  drwxr-xr-x  26 wmcneill  staff  832 Feb  4 14:12 pdfminer
  </code></pre>
  
  <p>Now I want to delete it, but Anaconda's <code>remove</code> command can't find the package.</p>
  
  <pre><code>$ conda remove pdfminer
  Collecting package metadata: done
  Solving environment: failed
  
  PackagesNotFoundError: The following packages are missing from the target environment:
    - pdfminer
  
  
  (tractatus) ~/src/tractatus
  $ conda remove pdfminer3k
  Collecting package metadata: done
  Solving environment: failed
  
  PackagesNotFoundError: The following packages are missing from the target environment:
    - pdfminer3k
  </code></pre>
  
  <p>pdfminer also does not appear in the installed packages list shown for this environment in the Anaconda Navigator UI.</p>
  
  <p>Is this a bug in Anaconda, or am I doing something wrong?</p>