ipywidgets: Widget Javascript not detected

debugging from notebook

from jupyter_core.paths import jupyter_config_path, jupyter_data_dir, jupyter_runtime_dir, jupyter_path
import jupyter_core.version

!echo !jupyter --version and --path
!jupyter --version
!jupyter --path
!echo

!echo !cat /usr/etc/jupyter/nbconfig/notebook.json
!cat /usr/etc/jupyter/nbconfig/notebook.json
!echo
!echo !ls /usr/local/share/jupyter/nbextensions/jupyter-js-widgets
!ls /usr/local/share/jupyter/nbextensions/jupyter-js-widgets
!echo

print('version:', jupyter_core.version.__version__)
for p in jupyter_config_path():
    print('config:', p)

# list of directories to search for data files...
for p in jupyter_path():
    print('jupyter_path:', p)

print('jupyter_data_dir:', jupyter_data_dir())
print('jupyter_runtime_dir:', jupyter_runtime_dir())

import ipywidgets as widgets
widgets.HTML(value="Hello <b>World</b>")

output

!jupyter --version and --path
4.1.0
config:
    /u/s8weber/.jupyter
    /usr/etc/jupyter
    /usr/local/etc/jupyter
    /etc/jupyter
data:
    /u/s8weber/.local/share/jupyter
    /usr/local/share/jupyter
    /usr/share/jupyter
runtime:
    /u/s8weber/.local/share/jupyter/runtime

!cat /usr/etc/jupyter/nbconfig/notebook.json
{
  "load_extensions": {
    "jupyter-js-widgets/extension": true
  }
}
!ls /usr/local/share/jupyter/nbextensions/jupyter-js-widgets
extension.js  extension.js.map

version: 4.1.0
config: /u/s8weber/.jupyter
config: /usr/etc/jupyter
config: /usr/local/etc/jupyter
config: /etc/jupyter
jupyter_path: /u/s8weber/.local/share/jupyter
jupyter_path: /usr/local/share/jupyter
jupyter_path: /usr/share/jupyter
jupyter_data_dir: /u/s8weber/.local/share/jupyter
jupyter_runtime_dir: /u/s8weber/.local/share/jupyter/runtime

** Widget Javascript not detected.  It may not be installed properly. Did you enable the widgetsnbextension? If not, then run "jupyter nbextension enable --py --sys-prefix widgetsnbextension"

using python3 and jupyterhub… not sure what next to look at.