This is based on Method 2 in https://websiteforstudents.com/installing-the-latest-python-3-7-on-ubuntu-16-04-18-04/
First, you need to install Python 3.7 (you will currently have Python 3.5.2):
sudo apt update
sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update
sudo apt install python3.7
You now have two different versions of Python 3!
$ python3 --version
# Outputs 3.5.2
$ python3.7 --version
# Outputs 3.7
So you need to use pipenv but tell it to use Python 3.7 instead.
In a brand new folder do this:
pipenv --python=python3.7 install jupyterlab
Now you should be able to continue using the regular commands in that folder, e.g.
pipenv install altair
pipennv install pandas
pipenv run jupyter lab
good job