[Python-modules-team] Bug#884528: python3-ipykernel: No module named ipykernel_launcher when trying to use python3 kernel on jupyter-notebook

[Édouard WILLISSECK]

Package: python3-ipykernel
Version: 4.5.2-2
Severity: important

Dear Maintainer,

I installed jupyter-notebook and by extension python3-ipykernel.

When I start jupyter-notebook and create a new notebook using Python 3 kernel,
I get the following warnings :

[I 11:45:10.392 NotebookApp] Kernel started:
b6878ff1-46dd-4854-a6b4-96ae76ae8dc3
/usr/bin/python: No module named ipykernel_launcher
[I 11:45:13.393 NotebookApp] KernelRestarter: restarting kernel (1/5)
/usr/bin/python: No module named ipykernel_launcher
[I 11:45:16.397 NotebookApp] KernelRestarter: restarting kernel (2/5)
/usr/bin/python: No module named ipykernel_launcher
[I 11:45:19.401 NotebookApp] KernelRestarter: restarting kernel (3/5)
/usr/bin/python: No module named ipykernel_launcher

Then it stops with a message saying that the kernel has died.

It works fine for the python 2 kernel though.



-- System Information:
Debian Release: 9.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages python3-ipykernel depends on:
ii  ipython3                5.1.0-3
ii  python3                 3.5.3-1
ii  python3-jupyter-client  4.4.0-2
ii  python3-tornado         4.4.3-1
ii  python3-traitlets       4.3.1-1

python3-ipykernel recommends no packages.

python3-ipykernel suggests no packages.

-- no debconf information