Launching "Additional Drivers" causes package python3-apt 1.1.0~beta1build1 failed to install/upgrade: package python3-apt is already installed and configured

After upgrade from 14.04 to 16.04.

Trying to configure graphics drivers by launching "Additional Drivers". This triggers an "already installed" error report with python3-apt 1.1.0~beta1build1

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: python3-apt 1.1.0~beta1build1
ProcVersionSignature: Ubuntu 3.13.0-92.139-generic 3.13.11-ckt39
Uname: Linux 3.13.0-92-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.5
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
Date: Wed Feb 8 14:39:23 2017
DuplicateSignature:
 package:python3-apt:1.1.0~beta1build1
 Processing triggers for initramfs-tools (0.122ubuntu8.8) ...
 update-initramfs: Generating /boot/initrd.img-4.4.0-62-generic
 dpkg: error processing package dh-python (--configure):
  package dh-python is already installed and configured
ErrorMessage: package python3-apt is already installed and configured
InstallationDate: Installed on 2014-09-24 (868 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.19
SourcePackage: python-apt
Title: package python3-apt 1.1.0~beta1build1 failed to install/upgrade: package python3-apt is already installed and configured
UpgradeStatus: Upgraded to xenial on 2017-02-08 (0 days ago)