Hi I just installed jupyterhub using conda install jupyterhub

However It not work until I installed notebook.

I noticed when I install jupyterhub, it has some other component installed, like jupyterhub-singleuser, jupyter-kernel,jupyter-lab,jupyter-notebook,jupyter-server,etc.

My question is:
1 what are those components used for? I just want a jupyterhub service.
2 since it has already installed jupyter-lab, jupyter-notebook, why I still need to install notebook package to complete the pieces.

I mean it provide a lot of service but didn’t provide the essential needed package.