package lightdm 1.30.0-0ubuntu4~20.04.2 failed to install/upgrade: end of file on stdin at conffile prompt

[Tom Kuiper]

Nothing obviously wrong that I could tell

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: lightdm 1.30.0-0ubuntu4~20.04.2
ProcVersionSignature: Ubuntu 5.4.0-96.109-generic 5.4.157
Uname: Linux 5.4.0-96-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
AptOrdering:
 rfkill:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
CasperMD5CheckResult: skip
Date: Tue May 3 06:05:52 2022
DpkgHistoryLog:
 Start-Date: 2022-05-03 06:05:50
 Commandline: /usr/bin/unattended-upgrade
 Upgrade: rfkill:amd64 (2.34-0.1ubuntu9.1, 2.34-0.1ubuntu9.3)
ErrorMessage: end of file on stdin at conffile prompt
InstallationDate: Installed on 2018-12-10 (1239 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
Python3Details: /usr/bin/python3.8, Python 3.8.10, 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 2.0.6
SourcePackage: lightdm
Title: package lightdm 1.30.0-0ubuntu4~20.04.2 failed to install/upgrade: end of file on stdin at conffile prompt
UpgradeStatus: Upgraded to focal on 2021-12-15 (139 days ago)
mtime.conffile..etc.pam.d.lightdm: 2018-12-10T13:15:57.713002