>>> "UB" == Uwe Brauer writes: > Hi > I am running Ubuntu 16.04 and I installed python3.6 (which is not > officially supported for that Ubuntu version via > https://askubuntu.com/questions/865554/how-do-i-install-python-3-6-using-apt-get > I also installed > sudo -H python3.6 -m pip install jupyter > sudo -H python3.6 -m pip install pexpect > sudo -H python3.6 -m pip install matlab_kernel I finally gave up that approach: I uninstalled 2019b and installed 2019a (the latest version that is compatible with 3.5). I uninstalled 3.6 and all the packages I installed with pip I installed the mathwork python engine. But now ob-ipython gives me an serious error, so that org mode is basically not usable. I have to comment out (require 'ob-ipython) BTW since I installed it via the emacs package system that require shouldn't be necessary? In any case I obtain the following serious error when opening an org-file Debugger entered--Lisp error: (json-readtable-error 84) signal(json-readtable-error (84)) json-read() json-read-array() json-read() json-read-from-string("[TerminalIPythonApp] WARNING | Subcommand `ipython...") ob-ipython--get-kernels() ob-ipython-auto-configure-kernels() run-hooks(change-major-mode-after-body-hook text-mode-hook outline-mode-hook org-mode-hook) apply(run-hooks (change-major-mode-after-body-hook text-mode-hook outline-mode-hook org-mode-hook)) Etc I have set (setq ob-ipython-command "ipython") The default is jupyter, but it gives the same error. I am now puzzled. Is there anybody still using this package? Regards Uwe Brauer