Public bug reported: I also had a login loop. nothing unusual with my install - just upgrading packages. Nothing custom.
ProblemType: Package DistroRelease: Ubuntu 20.04 Package: lightdm 1.30.0-0ubuntu3.1 ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41 Uname: Linux 5.4.0-37-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.3 AptOrdering: slick-greeter:amd64: Remove lightdm:amd64: Remove NULL: ConfigurePending Architecture: amd64 CasperMD5CheckResult: skip Date: Thu Jun 4 23:43:52 2020 ErrorMessage: installed lightdm package pre-removal script subprocess returned error exit status 10 InstallationDate: Installed on 2020-05-18 (22 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2 PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4 RelatedPackageVersions: dpkg 1.19.7ubuntu3 apt 2.0.3 SourcePackage: lightdm Title: package lightdm 1.30.0-0ubuntu3.1 failed to install/upgrade: installed lightdm package pre-removal script subprocess returned error exit status 10 UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: lightdm (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-package focal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1882867 Title: package lightdm 1.30.0-0ubuntu3.1 failed to install/upgrade: installed lightdm package pre-removal script subprocess returned error exit status 10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1882867/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs