How to manage Students and/as Jupyterhub users and all the config files

Operating system

Ubuntu 18.02

`nbgrader --version`

Python version 3.7.3 (default, Mar 27 2019, 22:11:17) [GCC 7.3.0] nbgrader version 0.6.1

`jupyterhub --version` (if used with JupyterHub)

1.0.0 ERROR:asyncio:Task exception was never retrieved future: <Task finished coro=<JupyterHub.launch_instance_async() done, defined at /opt/tljh/user/lib/python3.7/site-packages/jupyterhub/app.py:2477> exception=SystemExit(0)> Traceback (most recent call last): File "/opt/tljh/user/lib/python3.7/site-packages/jupyterhub/app.py", line 2492,in launch_instance loop.start() File "/opt/tljh/user/lib/python3.7/site-packages/tornado/platform/asyncio.py", line 149, in start self.asyncio_loop.run_forever() File "/opt/tljh/user/lib/python3.7/asyncio/base_events.py", line 539, in run_forever self._run_once() File "/opt/tljh/user/lib/python3.7/asyncio/base_events.py", line 1775, in _run_once handle._run() File "/opt/tljh/user/lib/python3.7/asyncio/events.py", line 88, in _run self._context.run(self._callback, self._args) File "/opt/tljh/user/lib/python3.7/site-packages/jupyterhub/app.py", line 2479,in launch_instance_async await self.initialize(argv) File "/opt/tljh/user/lib/python3.7/site-packages/jupyterhub/app.py", line 2085,in initialize super().initialize(args, kwargs) File "/opt/tljh/user/lib/python3.7/site-packages/traitlets/config/application.py", line 86, in inner return method(app, *args, *kwargs) File "/opt/tljh/user/lib/python3.7/site-packages/traitlets/config/application.py", line 326, in initialize self.parse_command_line(argv) File "/opt/tljh/user/lib/python3.7/site-packages/traitlets/config/application.py", line 86, in inner return method(app, args, kwargs) File "/opt/tljh/user/lib/python3.7/site-packages/traitlets/config/application.py", line 693, in parse_command_line self.exit(0) File "/opt/tljh/user/lib/python3.7/site-packages/traitlets/config/application.py", line 827, in exit sys.exit(exit_status) SystemExit: 0

`jupyter notebook --version`

6.1.4

Expected behavior

I want to create users in the Formgrader, so that the students can log in into the Jupyterhub and see their assignments.

Actual behavior

I don't know if the error above has something to do with my problem: I wanted to release the student version of a notebook which was succesfull. But i actually don't know how to access it as a student. When i add users via the nbrader database or through the formgrader, they appear on the formgrader, but not on the Jupyterhub Admin Interface. So, I can't login as the student. However, I don't know how to make a connection between the Jupyterhub user which are needed to login into the Jupyterhub, and the users i create in the formgrader.

Steps to reproduce the behavior

Manually create a directory with the Course Name
Place a global nbgrader_config.py in /etc/jupyter with Exchange setup
Place a nbgrader_config.py in /home/user/.jupyter with information about course directory root
Place a nbgrader_config.py in the courses directory with information about course directory root and course ID
Place a Jupyterhub_config.py in /etc/jupyterhub with information about user

Detailed content of the files taken from: https://github.com/jupyter/nbgrader/tree/7f916faaa6fdad35113c0b80e818ebb87f8cf376/demos/demo_multiple_classes

jupyter / nbgrader