Ubuntu 16.04 ImportError: No module named 'jupyter_client'

Hi

I am running Ubuntu 16.04, upgraded to pip 9.03 (because pip 10 has a
bug), running emacs git master from June.

I installed your package via melpa, then
I installed, via pip, the matlab kernel and the jupyter client. Both are
in
/usr/local/lib/python2.7/dist-packages
```

drwxrwsr-x 40 root staff 4.0K Jul 2 11:26 .
drwxr-sr-x 2 root staff 4.0K Jul 2 11:26 matlab_kernel
drwxr-sr-x 2 root staff 4.0K Jul 2 11:26 matlab_kernel-0.15.1.dist-info
drwxr-sr-x 6 root staff 4.0K Jul 2 11:26 metakernel
drwxr-sr-x 2 root staff 4.0K Jul 2 11:26 metakernel-0.20.14.dist-info
drwxr-sr-x 2 root staff 4.0K Jul 2 11:26 ipykernel-4.8.2.dist-info
drwxr-sr-x 8 root staff 4.0K Jul 2 11:26 ipykernel
-rw-r--r-- 1 root staff 552 Jul 2 11:26 ipykernel_launcher.pyc
drwxr-sr-x 2 root staff 4.0K Jul 2 11:26 ipython-5.7.0.dist-info
drwxr-sr-x 11 root staff 4.0K Jul 2 11:26 IPython
drwxr-sr-x 5 root staff 4.0K Jul 2 11:26 jupyter_client
drwxr-sr-x 2 root staff 4.0K Jul 2 11:26 jupyter_client-5.2.3.dist-info

```

Now following the advice of John Kitchin, I try to execute the following
code
```

#+BEGIN_SRC emacs-lisp
(add-to-list 'org-src-lang-modes '("matlab" . matlab))

;; set default headers for convenience
(setq org-babel-default-header-args:matlab
'((:results . "output replace")
(:session . "matlab")
(:kernel . "matlab")
(:exports . "code")
(:cache . "no")
(:noweb . "no")
(:hlines . "no")
(:tangle . "no")))

(defalias 'org-babel-execute:matlab 'org-babel-execute:ipython)
(defalias 'org-babel-prep-session:matlab 'org-babel-prep-session:ipython)
(defalias 'org-babel-matlab-initiate-session 'org-babel-ipython-initiate-session)
#+END_SRC

```
```

#+RESULTS:
: org-babel-matlab-initiate-session

#+BEGIN_SRC matlab :results output org drawer
x = [1, 2, 3, 4, 5];
fprintf('|%d', x)
#+END_SRC

```
But I obtain the following error in the debug buffer
```

Traceback (most recent call last):
File "/home/oub/.emacs.d/elpa/ob-ipython-20180224.153/client.py", line 1, in
import jupyter_client as client
ImportError: No module named 'jupyter_client'
```

I also tried the example provided in
https://github.com/gregsexton/ob-ipython
but the result was the same.

So how shall I modify that line in the client.py?

Thanks and regards

Uwe Brauer