package dbus 1.12.2-1ubuntu1 failed to install/upgrade: triggers looping, abandoned

[nigel]

failed to upgrade

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: dbus 1.12.2-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
Date: Tue Sep 25 21:11:33 2018
ErrorMessage: triggers looping, abandoned
InstallationDate: Installed on 2015-10-20 (1072 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: dbus
Title: package dbus 1.12.2-1ubuntu1 failed to install/upgrade: triggers looping, abandoned
UpgradeStatus: Upgraded to bionic on 2018-09-25 (0 days ago)