[Ubuntu] qgis-providers fails to install

[Martin Weis]

Hello,

Recently I wanted to upgrade qgis, but it fails due to package
qgis-providers, which core dumps here during installation.

> Setting up qgis-providers (1:3.22.2+32focal-ubuntugis) ...
> free(): invalid pointer
> Aborted (core dumped)
> dpkg: error processing package qgis-providers (--configure):
>  installed qgis-providers package post-installation script subprocess returned error exit status 134
> Setting up python3-owslib (0.25.0-1~focal0) ...
> dpkg: dependency problems prevent configuration of qgis:
>  qgis depends on qgis-providers (= 1:3.22.2+32focal-ubuntugis); however:
>   Package qgis-providers is not configured yet.

I have no clue what exactly fails here, the crash dump did not contain
more hints than this (I can provide it, if it helps you, excerpt with
versions below).

Any idea how to debug the installation further?
dpkg does not really show more details:

dpkg --debug=72200 -i
/var/cache/apt/archives/qgis-providers_1%3a3.22.2+32focal-ubuntugis_amd64.deb

(Reading database ... 660139 files and directories currently installed.)
Preparing to unpack
.../qgis-providers_1%3a3.22.2+32focal-ubuntugis_amd64.deb ...
D020000: trigproc_activate_packageprocessing pkg=qgis-providers:amd64
Unpacking qgis-providers (1:3.22.2+32focal-ubuntugis) over
(1:3.22.2+32focal-ubuntugis) ...
D002000: infodb foreach file this pkg
D002000: infodb foreach file this pkg
D002000: infodb foreach file this pkg
D002000: infodb foreach file this pkg
Setting up qgis-providers (1:3.22.2+32focal-ubuntugis) ...
D020000: trigproc_activate_packageprocessing pkg=qgis-providers:amd64
free(): invalid pointer
Aborted (core dumped)


Unpacking the deb (ar -x ...deb, tar xf ...) yields only few control files

# md5sum -c md5sums # all OK
# ./postinst # OK, returns 0



The only other thing I can spot is a warning in plotly (I guess it is
unrelated, because some more packages follow successful after):

> Setting up python3-plotly (4.4.1+dfsg-1) ...
> /usr/lib/python3/dist-packages/_plotly_utils/utils.py:214: SyntaxWarning: "is" with a literal. Did you mean "=="?
>   if (iso_string.split("-")[:3] is "00:00") or (iso_string.split("+")[0] is "00:00"):


I am on 20.04 with

> apt-cache policy qgis-providers
> qgis-providers:
>   Installed: 1:3.22.2+32focal-ubuntugis
>   Candidate: 1:3.22.2+32focal-ubuntugis
>   Version table:
>  *** 1:3.22.2+32focal-ubuntugis 500
>         500 https://qgis.org/ubuntugis focal/main amd64 Packages
>         100 /var/lib/dpkg/status
>      3.16.14+dfsg-1~focal0 500
>         500 http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu focal/main amd64 Packages
>      3.10.4+dfsg-1ubuntu2 500
>         500 http://de.archive.ubuntu.com/ubuntu focal/universe amd64 Packages

> apt-cache policy | grep gis
>  500 http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu focal/main i386 Packages
>      release v=20.04,o=LP-PPA-ubuntugis-ubuntugis-unstable,a=focal,n=focal,l=ubuntugis-unstable,c=main,b=i386
>  500 http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu focal/main amd64 Packages
>      release v=20.04,o=LP-PPA-ubuntugis-ubuntugis-unstable,a=focal,n=focal,l=ubuntugis-unstable,c=main,b=amd64
>  500 https://qgis.org/ubuntugis focal/main amd64 Packages
>      origin qgis.org


Small excerpt from crash report

> == ProcVersionSignature =================================
> Ubuntu 5.11.0-43.47~20.04.2-generic 5.11.22
>
> == Python3Details =================================
> /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
>
> == PythonDetails =================================
> /usr/bin/python3.8, Python 3.8.10, python-is-python3, 3.8.2-4
>
> == Title =================================
> package qgis-providers 1:3.22.2+32focal-ubuntugis [origin: QGIS project] failed to install/upgrade: installed qgis-providers package post-installation script subprocess returned error exit status 134