package ca-certificates 20160104ubuntu0.14.04.1 failed to install/upgrade: triggers looping, abandoned

[Jamie Strandboge]

Upgraded a server from 14.04 to 16.04 and encountered this as part of the upgrade.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: ca-certificates 20160104ubuntu0.14.04.1
ProcVersionSignature: Ubuntu 3.13.0-85.129-generic 3.13.11-ckt36
Uname: Linux 3.13.0-85-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Thu Apr 21 15:10:48 2016
DuplicateSignature: package:ca-certificates:20160104ubuntu0.14.04.1:triggers looping, abandoned
ErrorMessage: triggers looping, abandoned
InstallationDate: Installed on 2012-07-01 (1390 days ago)
InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.10ubuntu1
SourcePackage: ca-certificates
Title: package ca-certificates 20160104ubuntu0.14.04.1 failed to install/upgrade: triggers looping, abandoned
UpgradeStatus: Upgraded to xenial on 2016-04-21 (0 days ago)

[Launchpad Janitor (janitor)]

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

[Dave Gregory (dave-gregory)]

I'd appreciate some advice on how much of a problem this represents. Trying to do some early testing on at 14.04 to 16.04 upgrade and can't tell how badly this has interfered with the upgrade, and whether it would invalidate my testing...
Also would appreciate any advice on a workaround if there is one.
Apols if this info is available somewhere else and I just haven't found it.