title: I installed a jupyterhub on my remote server, but when I access it, it shows jupyter notebook, not jupyter lab
body: <p>I have added <code>c.Spawner.cmd = ['jupyter-labhub', '--notebook-dir', '/mnt/home']</code> in jupyter_config.py</p>
  <p>I want this:</p>
  <p><img src="https://i.stack.imgur.com/edsnS.png" alt="enter image description here" /></p>
  <p>but it show me this：</p>
  <p><img src="https://i.stack.imgur.com/P9gj4.png" alt="enter image description here" /></p>