package libpam0g:amd64 1.3.1-5ubuntu4.1 failed to install/upgrade: installed libpam0g:amd64 package post-installation script subprocess was killed by signal (Aborted), core dumped

[_JEANPHI_]

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ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: libpam0g:amd64 1.3.1-5ubuntu4.1
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Oct 8 10:55:19 2020
ErrorMessage: installed libpam0g:amd64 package post-installation script subprocess was killed by signal (Aborted), core dumped
InstallationDate: Installed on 2017-06-10 (1215 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: pam
Title: package libpam0g:amd64 1.3.1-5ubuntu4.1 failed to install/upgrade: installed libpam0g:amd64 package post-installation script subprocess was killed by signal (Aborted), core dumped
UpgradeStatus: Upgraded to focal on 2020-10-08 (0 days ago)

[Steve Langasek (vorlon)]

The error in the log is:

Setting up libpam0g:amd64 (1.3.1-5ubuntu4.1) ...
Fontconfig warning: "/etc/fonts/conf.avail/53-monospace-lcd-filter.conf", line 10: Having multiple values in <test> isn't supported and may not work as expected
Checking for services that may need to be restarted...Checking init scripts...

(frontend:29789): Gtk-ESC[1;33mWARNINGESC[0m **: ESC[34m10:55:19.067ESC[0m: Could not load a pixbuf from icon theme.
This may indicate that pixbuf loaders or the mime database could not be found.
**
Gtk:ERROR:../../../../gtk/gtkiconhelper.c:494:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /org/gtk/libgtk/icons/48x48/status/image-missing.png: Format d'image non reconnu (gdk-pixbuf-error-quark, 3)
sh: printf: I/O error
dpkg: error processing package libpam0g:amd64 (--configure):
 installed libpam0g:amd64 package post-installation script subprocess was killed by signal (Aborted), core dumped

It seems the gnome frontend to debconf is broken on your system at the time libpam0g is being configured. debconf needs to be able to handle this more gracefully.