Error

jupyter: 'lab' is not a Jupyter command
Error executing Jupyter command 'lab': [Errno 2] No such file or directory

Solution - Ok

sudo -H pip2 install jupyterlab
sudo -H pip3 install jupyterlab
jupyter serverextension enable --py jupyterlab --sys-prefix

Problème - Fail

L'installation en fonctionne pas avec

sudo pip --user jupyterlab