title: Error installing/initiating pgadmin4 SQLAlchemy 1.1.0 or greater is required
body: <p>i'm installing pgadmin4 in Mint 19, following this instructions:</p>
  
  <p><a href="https://linuxhint.com/install-pgadmin4-ubuntu/" rel="nofollow noreferrer">https://linuxhint.com/install-pgadmin4-ubuntu/</a></p>
  
  <p>When i come to run:</p>
  
  <pre><code>https://linuxhint.com/install-pgadmin4-ubuntu/
  </code></pre>
  
  <p>I have an error:</p>
  
  <pre><code>File "/home/nico/pgadamin4/pgAdmin4/local/lib/python2.7/site-packages/alembic/util/__init__.py", line 31, in &lt;module&gt;
      raise CommandError("SQLAlchemy 1.1.0 or greater is required. ")
  alembic.util.exc.CommandError: SQLAlchemy 1.1.0 or greater is required
  </code></pre>
  
  <p>at this point, i don't know how to proceed. I don't really understand the whole installing process, using the virtual environment, so i can't add more information. Anyone can help? Thanks!</p>