Change python version system-wide

This page has a great explanation for switching between Python and Python3:
https://linuxconfig.org/how-to-change-from-default-to-alternative-python-version-on-debian-linux

sudo update-alternatives --config python

Installing Jupyter

Since in Python 3, ConfigParser has been renamed to configparser I switched to Python using:
Then for installing and running a Notebook:

sudo apt-get install python-setuptools
sudo easy_install pip
sudo pip install notebook
jupyter notebook