I also experienced this bug. I was running Ubuntu 18.04, and I upgraded to Ubuntu 20.20 yesterday by running `update-manager -d` on the command- line, which launched the GUI. During the upgrade itself, I was shown a dialog displaying an error relating to pam.
I've attached apt-term.log (for me) to this comment. Here is the relevant error, I think, I don't know how to find the core dump: Preparing to unpack .../libpam0g_1.3.1-5ubuntu4_amd64.deb ... Unpacking libpam0g:amd64 (1.3.1-5ubuntu4) over (1.1.8-3.6ubuntu2.18.04.1) ... Setting up libpam0g:amd64 (1.3.1-5ubuntu4) ... 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 GLib-GObject-WARNING **: specified class size for type 'PangoCairoFcFont' is smaller than the parent type's 'PangoFcFont' class size at /usr/lib/x86_64-linux-gnu/perl5/5.30/Glib/Object/Introspection.pm line 67. GLib-GObject-CRITICAL **: g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE (instance_type)' failed at /usr/lib/x86_64-linux-gnu/perl5/5.30/Glib/Object/Introspection.pm line 67. GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed at /usr/lib/x86_64-linux-gnu/perl5/5.30/Glib/Object/Introspection.pm line 67. GLib-GObject-CRITICAL **: g_object_new_valist: assertion 'G_TYPE_IS_OBJECT (object_type)' failed at /usr/lib/x86_64-linux-gnu/perl5/5.30/Glib/Object/Introspection.pm line 67. dpkg: error processing package libpam0g:amd64 (--configure): installed libpam0g:amd64 package post-installation script subprocess was killed by signal (Segmentation fault), core dumped Errors were encountered while processing: libpam0g:amd64 (Reading database ... (Reading database ... 5% (Reading database ... 10% (Reading database ... 15% (Reading database ... 20% (Reading database ... 25% (Reading database ... 30% (Reading database ... 35% (Reading database ... 40% (Reading database ... 45% (Reading database ... 50% (Reading database ... 55% (Reading database ... 60% (Reading database ... 65% (Reading database ... 70% (Reading database ... 75% (Reading database ... 80% (Reading database ... 85% (Reading database ... 90% (Reading database ... 95% (Reading database ... 100% (Reading database ... 276143 files and directories currently installed.) Preparing to unpack .../libpam-modules-bin_1.3.1-5ubuntu4_amd64.deb ... Unpacking libpam-modules-bin (1.3.1-5ubuntu4) over (1.1.8-3.6ubuntu2.18.04.1) ... dpkg: dependency problems prevent configuration of libpam-modules-bin: libpam-modules-bin depends on libpam0g (>= 0.99.7.1); however: Package libpam0g:amd64 is not configured yet. dpkg: error processing package libpam-modules-bin (--configure): dependency problems - leaving unconfigured Errors were encountered while processing: libpam-modules-bin dpkg: regarding .../libpam-modules_1.3.1-5ubuntu4_amd64.deb containing libpam-modules:amd64, pre-dependency problem: libpam-modules:amd64 pre-depends on libpam0g (>= 1.3.1) libpam0g:amd64 latest configured version is 1.1.8-3.6ubuntu2.18.04.1. dpkg: error processing archive /var/cache/apt/archives/libpam-modules_1.3.1-5ubuntu4_amd64.deb (--unpack): pre-dependency problem - not installing libpam-modules:amd64 Errors were encountered while processing: /var/cache/apt/archives/libpam-modules_1.3.1-5ubuntu4_amd64.deb dpkg: error processing package libpam-modules:amd64 (--configure): package libpam-modules:amd64 is already installed and configured Errors were encountered while processing: libpam-modules:amd64 ** Attachment added: "from flimm's machine" https://bugs.launchpad.net/ubuntu/+source/pam/+bug/1871960/+attachment/5356669/+files/apt-term.log -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pam in Ubuntu. https://bugs.launchpad.net/bugs/1871960 Title: package libpam-modules 1.1.8-3.6ubuntu2.18.04.1 failed to install/upgrade: pre-dependency problem - not installing libpam- modules:amd64 Status in pam package in Ubuntu: Incomplete Bug description: I was updating ubuntu to the 20.04 version. Not all packages were updated. I receive new errors every few seconds. what should I do? Thanks safi ProblemType: Package DistroRelease: Ubuntu 20.04 Package: libpam-modules 1.1.8-3.6ubuntu2.18.04.1 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 ApportVersion: 2.20.11-0ubuntu25 Architecture: amd64 Date: Fri Apr 10 00:36:08 2020 ErrorMessage: pre-dependency problem - not installing libpam-modules:amd64 InstallationDate: Installed on 2019-12-28 (102 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2 PythonDetails: N/A RelatedPackageVersions: dpkg 1.19.7ubuntu3 apt 2.0.1ubuntu1 SourcePackage: pam Title: package libpam-modules 1.1.8-3.6ubuntu2.18.04.1 failed to install/upgrade: pre-dependency problem - not installing libpam-modules:amd64 UpgradeStatus: Upgraded to focal on 2020-04-09 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pam/+bug/1871960/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
