package libpam-runtime 1.3.1-5ubuntu4.1 failed to install/upgrade: installed libpam-runtime package post-installation script subprocess returned error exit status 128

[Daisuke Aihara]

Dear Sirs/Madams, I am simply reporting this as the "pam package" directs.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: libpam-runtime 1.3.1-5ubuntu4.1
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: lkp_Ubuntu_5_4_0_42_46_generic_70
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Sep 10 22:56:49 2020
DuplicateSignature:
 package:libpam-runtime:1.3.1-5ubuntu4.1
 Setting up libpam-runtime (1.3.1-5ubuntu4.1) ...
 Use of uninitialized value $ret in string eq at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 134, <GEN0> line 1.
 dpkg: error processing package libpam-runtime (--configure):
  installed libpam-runtime package post-installation script subprocess returned error exit status 128
ErrorMessage: installed libpam-runtime package post-installation script subprocess returned error exit status 128
InstallationDate: Installed on 2020-09-10 (0 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
PackageArchitecture: all
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: pam
Title: package libpam-runtime 1.3.1-5ubuntu4.1 failed to install/upgrade: installed libpam-runtime package post-installation script subprocess returned error exit status 128
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.