$ jupyterhub-singleuser --debug
[D 2022-03-16 10:13:11.371 SingleUserNotebookApp application:174] Searching ['/home/jupyter-khoeflich', '/home/jupyter-khoeflich/.jupyter', '/home/jupyter-khoeflich/.local/etc/jupyter', '/opt/tljh/user/etc/jupyter', '/usr/local/etc/jupyter', '/etc/jupyter'] for config files
[D 2022-03-16 10:13:11.371 SingleUserNotebookApp application:731] Looking for jupyter_config in /etc/jupyter
[D 2022-03-16 10:13:11.371 SingleUserNotebookApp application:731] Looking for jupyter_config in /usr/local/etc/jupyter
[D 2022-03-16 10:13:11.371 SingleUserNotebookApp application:731] Looking for jupyter_config in /opt/tljh/user/etc/jupyter
[D 2022-03-16 10:13:11.371 SingleUserNotebookApp application:731] Looking for jupyter_config in /home/jupyter-khoeflich/.local/etc/jupyter
[D 2022-03-16 10:13:11.371 SingleUserNotebookApp application:731] Looking for jupyter_config in /home/jupyter-khoeflich/.jupyter
[D 2022-03-16 10:13:11.371 SingleUserNotebookApp application:731] Looking for jupyter_config i