Hi:-)
Installed Jupyter on Ubuntu Linux. looking on my linux intalation found that it came with Python 2.7 but the latest is 3.8. I don’t know if Jupyter caught up to 3.8 or should I use a lower Python 3x version.
And as far as I know, Jupyter packages should work great with 3.8. Please see individual Jupyter projects for more details about their python 3 support, of course.