Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/jupyterhub/singleuser/__init__.py", line 77, in <module>
    from .app import SingleUserNotebookApp, main
  File "/usr/lib/python3.10/site-packages/jupyterhub/singleuser/app.py", line 67, in <module>
    raise _import_error
  File "/usr/lib/python3.10/site-packages/jupyterhub/singleuser/app.py", line 59, in <module>
    App = import_item(JUPYTERHUB_SINGLEUSER_APP)
  File "/usr/lib/python3.10/site-packages/traitlets/utils/importstring.py", line 36, in import_item
    module = __import__(package, fromlist=[obj])
ModuleNotFoundError: No module named 'jupyter_server'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/bin/jupyterhub-singleuser", line 3, in <module>
    from jupyterhub.singleuser import main
  File "/usr/lib/python3.10/site-packages/jupyterhub/singleuser/__init__.py", line 84, in <module>
    raise ImportError(
ImportError: Failed to import default single-user server. Make sure to install dependencies for your single-user server, e.g.
    pip install jupyterlab