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

[Thatoo]

this occured during update from 16.04.5 to 18.04.1

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: dbus 1.12.2-1ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-25.27~16.04.1-generic 4.8.1
Uname: Linux 4.8.0-25-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Wed Aug 1 07:33:46 2018
ErrorMessage: triggers looping, abandoned
InstallationDate: Installed on 2016-08-28 (702 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
Python3Details: /usr/bin/python3.6, Python 3.6.5, 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 1.6.3
SourcePackage: dbus
Title: package dbus 1.12.2-1ubuntu1 failed to install/upgrade: triggers looping, abandoned
UpgradeStatus: No upgrade log present (probably fresh install)