upgrade from 18.10 to 19.04 failed, backout didn't run

[brynrahm]

Ran upgrade for 18.10 to 19.04. Towards the end of installing packages, there was an upgrade failed message saying it would run back-out. There was no mention of what specifically failed. The software updater then disappeared.
After rebooting (perhaps a mistake) system is apparently working and lsb -rd and System says it's 19.04

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: ubuntu-release-upgrader-core 1:19.04.16
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 19 18:46:49 2019
InstallationDate: Installed on 2014-04-06 (1839 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to disco on 2019-04-19 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

From Apttermlog.txt:

dpkg: cycle found while processing triggers:
 chain of packages whose triggers are or may be responsible:
  libgtk2.0-0:amd64 -> libc-bin
 packages' pending triggers which are or may be unresolvable:
  install-info: /usr/share/info
  sgml-base: /usr/share/xml: update-sgmlcatalog: /etc/sgml: /usr/share/sgml
  linux-image-5.0.0-13-generic: linux-update-5.0.0-13-generic
  shared-mime-info: /usr/share/mime/packages
  dbus: /etc/dbus-1/system.d
  software-center: /usr/share/locale-langpack: /usr/share/app-install/desktop
  ca-certificates: update-ca-certificates
  gnome-icon-theme: /usr/share/icons/gnome
  resolvconf: resolvconf-enable-updates
  systemd: /etc/init.d
  libc-bin: ldconfig
  libgtk2.0-0:amd64: /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/immodules
  dictionaries-common: update-default-ispell: update-default-wordlist: aspell-autobuildhash
  doc-base: /usr/share/doc-base
  hicolor-icon-theme: /usr/share/icons/hicolor
  initramfs-tools: update-initramfs
  mime-support: /usr/share/applications: /usr/lib/mime/packages
  bamfdaemon: gmenucache: /usr/share/applications
dpkg: error processing package install-info (--configure):
 triggers looping, abandoned

[Launchpad Janitor (janitor)]

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

[Abhinav Upadhyay (er-abhinav-upadhyay)]

I just did upgrade from 18.10 to 19.04 and had the same problem. I am not sure what's the damage done. After rebooting I had to manually run `apt autoremove` to remove the old packages. I haven't tested other things yet that I depend on.