Traceback (most recent call last):
  File "/usr/lib/python3.12/site-packages/jupyterlab/labhubapp.py", line 19, in <module>
    from jupyterhub.singleuser.mixins import make_singleuser_app
ModuleNotFoundError: No module named 'jupyterhub'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.12/site-packages/jupyterlab/labhubapp.py", line 23, in <module>
    from jupyterhub.singleuser import SingleUserNotebookApp as SingleUserServerApp
ModuleNotFoundError: No module named 'jupyterhub'

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

Traceback (most recent call last):
  File "/usr/bin/jupyter-labhub", line 3, in <module>
    from jupyterlab.labhubapp import main
  File "/usr/lib/python3.12/site-packages/jupyterlab/labhubapp.py", line 42, in <module>
    raise ImportError(error_msg) from e
ImportError: JupyterHub is not installed and is required to run this application.

Current Python environment: /usr

Python sys.path entries searched:
  - /usr/bin
  - /usr/lib/python312.zip
  - /usr/lib/python3.12
  - /usr/lib/python3.12/lib-dynload
  - /usr/lib/python3.12/site-packages

To fix this issue, install jupyterhub:
  pip install jupyterhub

Original error: No module named 'jupyterhub'