Error executing Jupyter command 'contrib': [Errno 2] No such file or directory

[gabriel1628]

I am working on Linux (ubuntu) in a python virtual environment and when I tried to install javascript and css files using

jupyter contrib nbextension install --user

I received the error

Error executing Jupyter command 'contrib': [Errno 2] No such file or directory

I don't know why, does somebody know?

After searching on the web I found this command (for linux users)

~/.local/bin/jupyter-contrib-nbextension install --user

and it solved my problem

[gabriel1628]

Ok so it seems notebook extensions don't work when they are installed via pip from a virtual environment, I don't know why but it has to be installed from user