ipywidgets, libc, Jupyter and Colab notebooks

ipywidgets, nodejs and Jupyter lab

Needs manual installation.
From here:

To install the JupyterLab extension you also need to run the command below in a terminal which requires that you have nodejs installed.

jupyter labextension install @jupyter-widgets/jupyterlab-manager

nodejs has dependencies that you need to install first. Do:
sudo apt-get install libssl1.0-dev
sudo apt-get install nodejs-dev
sudo apt-get install node-gyp
sudo apt-get install npm
sudo apt-get install nodejs
jupyter labextension install @jupyter-widgets/jupyterlab-manager

---

ipywidgets and Google Colaboratory

In a nutshell: you can't, or at least not yet.

Present status: check https://github.com/googlecolab/colabtools/issues/60