ubuntu-release-upgrader crashed focal->jammy trying to remove packages

[Steve Langasek]

Crash on a focal->jammy upgrade, left autoremovable packages installed and did not prompt for reboot.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubuntu-release-upgrader-core 1:22.04.15
ProcVersionSignature: Ubuntu 5.4.0-137.154-generic 5.4.218
Uname: Linux 5.4.0-137-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Jan 30 16:33:15 2023
InstallationDate: Installed on 2016-12-15 (2237 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to jammy on 2023-01-31 (0 days ago)
VarLogDistupgradeTermlog:

[Steve Langasek (vorlon)]

2023-01-30 16:30:28,386 DEBUG Start checking for obsolete pkgs
2023-01-30 16:30:39,155 DEBUG package 'libubsan0' produces an unwanted removal 'libgcc-5-dev', skipping
2023-01-30 16:30:40,668 WARNING _tryMarkObsoleteForRemoval failed for 'libubsan0' (Error('E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'): E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.)