what is --use-feature=2020-resolver? error message with jupyter installation on ubuntu

Question

I\'m trying to install jupyter on ubuntu 16.04.6 x64 on digital ocean droplet. It is giving me the following error message, and I can\'t understand what this means.

Answer 1

First check if your pip is updated:

python -m pip install --upgrade pip

and then use:

pip install example --use-feature=2020-resolver

It worked for me.