title: Conda returns Solving Environment: Done -- hangs with all processes
body: <p>I recently ran conda update --all. Conda successfully updated many packages and I can still run scripts I have written successfully.</p>
  
  <p>However, now when I try and update or remove any packages, or try and create a new virtual environment conda returns "Solving Environment: Done" and then does not make any progress. </p>
  
  <p>Any ideas on how to trouble-shoot?</p>
  
  <p>Thank you!</p>