After following the installation instruction, my jupyterhub can successfully start a jupyter notebook server, is there a way to start a user jupyterlab instance? I have googled it and watched the jupyterhub -h, but I got nothing. Thanks in advance 
I am not sure about a full-blown Jupyterhub install, but on TLJH ( The Littlest Jupyter Hub) you can easily switch by editing the web address; see:
http://tljh.jupyter.org/en/latest/howto/env/notebook-interfaces.html
-paul
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