No module named ipykernel_launcher
Solution 1:
Installing pip correctly is the answer
https://opensource.com/article/19/5/python-3-default-mac#what-to-do
install pip in the new directory, and from there- download jupyter-lab again.
Solution 2:
I was facing the same issue some time ago. Un-installing and re-installing jupyter from your virtual environment using conda/pip may help.