Due to a certain amount of heartache with JSROOT in Jupyter with the %jsroot on, magics not working, I realised that the solution lay in the ~/.jupyter/jupyter_notebook_config.py file where the variable, c.NotebookApp.extra_static_paths = [’$ROOTSYS/js’], was set along with c.MultiKernelManager.default_kernel_name = ‘python3’ was set also for good measure as the ROOT source where compiled with python3.
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_ROOT Version:6.20
_Platform: Ubuntu 18.04.4 LTS
_Compiler:g++ 7.4.0