Jupyter Notebook - OSError: [Errno 1] Operation not allowed

Question

I have an external python function that I want to run inside a Jupyter Notebook. It performs, among other things, the osmethod setpgrp:

os.setpgrp()

When I run the function, it causes the following error:

OSError: [Errno 1] Operation not allowed

The code works fine (no errors or warnings) when I call the method from a regular python .pyscript or directly from the console. The problem only occurs in a Jupyter laptop.

I got the same error when I run the following code directly in the notebook:

import os
os.setpgrp()

I changed the permission and ownership of all related files, started Jupyter with sudo, but did not change anything.

OS: Lubuntu 16.04

Do you have any ideas what might cause this error?