Also experienced this issue upgrading from 18.10 (stable) to 19.04 (stable). This seems like a minor issue that should not halt the entire upgrade process in its tracks.
Probable dupe of #1400195 or #1766890. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=765781 Relevent excerpt from apt-term.log indicates it might be tied to libgtk2.0-0 as opposed to software-center in OP's log: 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 ca-certificates: update-ca-certificates gnome-icon-theme: /usr/share/icons/gnome 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 hicolor-icon-theme: /usr/share/icons/hicolor initramfs-tools: update-initramfs mime-support: /usr/share/applications: /usr/lib/mime/packages dpkg: error processing package install-info (--configure): triggers looping, abandoned ** Bug watch added: Debian Bug tracker #765781 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=765781 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to texinfo in Ubuntu. https://bugs.launchpad.net/bugs/1821349 Title: package install-info 6.5.0.dfsg.1-4build1 failed to install/upgrade: triggers looping, abandoned Status in texinfo package in Ubuntu: Confirmed Bug description: I was upgrading a machine from 18.10 to 19.04 with "do-release-upgrade -d". This system was updated from 14.04 to 16.04 to 18.04 to 18.10, and today from 18.10 to 19.04. Looks like this crashed towards the end of the upgrade. After reporting this bug it proceeded to dpkg --configure -a, and once the upgrade finished, I did an apt-get update and apt-get dist-upgrade. Seems okay. ProblemType: Package DistroRelease: Ubuntu 19.04 Package: install-info 6.5.0.dfsg.1-4build1 ProcVersionSignature: Ubuntu 4.18.0-16.17-generic 4.18.20 Uname: Linux 4.18.0-16-generic x86_64 ApportVersion: 2.20.10-0ubuntu23 Architecture: amd64 Date: Fri Mar 22 13:03:18 2019 ErrorMessage: triggers looping, abandoned InstallationDate: Installed on 2015-12-23 (1184 days ago) InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) Python3Details: /usr/bin/python3.7, Python 3.7.2+, python3-minimal, 3.7.2-1 PythonDetails: /usr/bin/python2.7, Python 2.7.16, python-minimal, 2.7.16-1 RelatedPackageVersions: dpkg 1.19.5ubuntu1 apt 1.8.0 SourcePackage: texinfo Title: package install-info 6.5.0.dfsg.1-4build1 failed to install/upgrade: triggers looping, abandoned UpgradeStatus: Upgraded to disco on 2019-03-22 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/texinfo/+bug/1821349/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp