package ca-certificates 20160104ubuntu1 failed to install/upgrade: triggers looping, abandoned

[Maverick]

Upgrading MSI GE72 2QC Apache Laptop with dual-boot Seven Pro + SSD
from 14.04 to 16.04 via UI (NOT dist-upgrade)

I had agreed to overwriting one configuration (preferences ?) file

Possible video issues ? (NVIDIA GTX960M)

prompt:~$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04

apt-cache policy pkgname
N: Impossible de trouver le paquet pkgname

I didn't know what to expect (message with dpkg-configure -a

Ended up with blank screen + blinking cursor up left
==> cold boot (big red button)
==> GRUB OK, Ubuntu booted fine

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: ca-certificates 20160104ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Fri Aug 26 16:57:02 2016
ErrorMessage: triggers looping, abandoned
InstallationDate: Installed on 2016-02-07 (201 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: ca-certificates
Title: package ca-certificates 20160104ubuntu1 failed to install/upgrade: triggers looping, abandoned
UpgradeStatus: Upgraded to xenial on 2016-08-26 (0 days ago)

[Maverick (paul-girault)]

I reported this as per instructions on the ca-certificate looping issue