in python3 draw() function displays no graphic window

Hi erverybody
I am new in Netgen/NGSolve. My first step was running the poisson.py example, but no graphic will be displayed.
The script simply ends without any error messege.
I use ubuntu 22.10 and python3. The installation runs without any error message. I also installed jupyter-notebook and extensions accordin the install instruchtions 
can anyone help me?
 

Try running the script either with the installed netgen executable or with

Hello Christopher
Thank you for your helpful hint
variant “netgen poisson.py” works
variant “python3 -m netgen poisson.py” works too
But with jupyter-notebook the Draw() function works also
The problem occurs only in pure python3
Actually, I have no problem with tat, I simply use the -m netgen variantmany Thanks
Hermann

alternatively, you can add

import netgen.gui

into the python file, and something like
input("press return key")
at the end.

Joachim

The GUI works fine now
I feel like a child on a playground...
Many Thanks
Hermann