Arch Linux

Description: Unable to launch "jupyter lab" due to missing dependency.

$ jupyter lab
Traceback (most recent call last):
File "/usr/bin/jupyter-lab", line 6, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3259, in <module>
def _initialize_master_working_set():
File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3242, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3271, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 584, in _build_master
ws.require(__requires__)
File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 901, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 787, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'requests' distribution was not found and is required by jupyterlab-server

$ pacman -Q | grep jupyter
jupyter 4.6.3-1
jupyter-nbconvert 5.6.1-1
jupyter-nbformat 4.4.0-4
jupyter-notebook 6.0.3-1
jupyter-widgetsnbextension 1:3.5.1-1
jupyter_console 6.1.0-1
jupyterlab 2.1.0-1
jupyterlab_server 1.1.0-1
python-jupyter_client 6.0.0-1
python-jupyter_core 4.6.3-1

Installing "extra/python-requests" fixes the issue.