>>> "MS" == Martin Schöön <martin.schoon@gmail.com> writes:

> I learned the hard way not to mix distro installed Python with pip
> installed Python. I now always use "pip install --user
>  <some package>" to keep things sane.

Right, I installed python3.6 from a ppa, and that increased the mess. I uninstalled python3.6, also had to uninstall and then reinstall ob-ipython before I got rid of that error.