[Python-modules-team] Bug#917705: ipywidgets: FTBFS: build-dependency not installable: python-jupyter-sphinx-theme

[Lucas Nussbaum]

Source: ipywidgets
Version: 6.0.0-2
Severity: serious
Justification: FTBFS on amd64
Tags: buster sid
Usertags: ftbfs-20181229 ftbfs-buster

Hi,

During a rebuild of all packages in sid, your package failed to build
on amd64.

Relevant part (hopefully):
> +------------------------------------------------------------------------------+
> | Install package build dependencies                                           |
> +------------------------------------------------------------------------------+
> 
> 
> Setup apt archive
> -----------------
> 
> Merged Build-Depends: debhelper (>= 10), dh-python, node-recast, libjs-jquery, libjs-jquery-ui, node-backbone, node-d3-format, node-es6-promise, node-semver, node-typescript, node-typescript-types, node-underscore, patch, python-all, python-pytest, python-setuptools (>= 28), python-coverage, python-ipython, python-ipykernel, python-jupyter-sphinx-theme, python-nose, python-traitlets, python-sphinx, python-sphinx-rtd-theme, python3-all, python3-pytest, python3-setuptools (>= 28), python3-coverage, python3-ipython, python3-ipykernel, python3-jupyter-sphinx-theme, python3-nose, python3-traitlets, python3-sphinx, python3-sphinx-rtd-theme, pandoc, m4
> Filtered Build-Depends: debhelper (>= 10), dh-python, node-recast, libjs-jquery, libjs-jquery-ui, node-backbone, node-d3-format, node-es6-promise, node-semver, node-typescript, node-typescript-types, node-underscore, patch, python-all, python-pytest, python-setuptools (>= 28), python-coverage, python-ipython, python-ipykernel, python-jupyter-sphinx-theme, python-nose, python-traitlets, python-sphinx, python-sphinx-rtd-theme, python3-all, python3-pytest, python3-setuptools (>= 28), python3-coverage, python3-ipython, python3-ipykernel, python3-jupyter-sphinx-theme, python3-nose, python3-traitlets, python3-sphinx, python3-sphinx-rtd-theme, pandoc, m4
> dpkg-deb: building package 'sbuild-build-depends-ipywidgets-dummy' in '/<<BUILDDIR>>/resolver-8cqdG0/apt_archive/sbuild-build-depends-ipywidgets-dummy.deb'.
> dpkg-scanpackages: warning: Packages in archive but missing from override file:
> dpkg-scanpackages: warning:   sbuild-build-depends-core-dummy sbuild-build-depends-ipywidgets-dummy
> dpkg-scanpackages: info: Wrote 2 entries to output Packages file.
> Ign:1 copy:/<<BUILDDIR>>/resolver-8cqdG0/apt_archive ./ InRelease
> Get:2 copy:/<<BUILDDIR>>/resolver-8cqdG0/apt_archive ./ Release [963 B]
> Ign:3 copy:/<<BUILDDIR>>/resolver-8cqdG0/apt_archive ./ Release.gpg
> Get:4 copy:/<<BUILDDIR>>/resolver-8cqdG0/apt_archive ./ Sources [705 B]
> Get:5 copy:/<<BUILDDIR>>/resolver-8cqdG0/apt_archive ./ Packages [781 B]
> Fetched 2449 B in 0s (0 B/s)
> Reading package lists...
> Reading package lists...
> 
> Install ipywidgets build dependencies (apt-based resolver)
> ----------------------------------------------------------
> 
> Installing build dependencies
> Reading package lists...
> Building dependency tree...
> Reading state information...
> Some packages could not be installed. This may mean that you have
> requested an impossible situation or if you are using the unstable
> distribution that some required packages have not yet been created
> or been moved out of Incoming.
> The following information may help to resolve the situation:
> 
> The following packages have unmet dependencies:
>  sbuild-build-depends-ipywidgets-dummy : Depends: python-jupyter-sphinx-theme but it is not going to be installed
> E: Unable to correct problems, you have held broken packages.
> apt-get failed.

The full build log is available from:
   http://aws-logs.debian.net/2018/12/29/ipywidgets_6.0.0-2_unstable.log

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.