package update-notifier-common 3.168.3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Laurie]

I've been having issues with the package-update-notifier-common reporting it isn't configured since flashupdateinstaller tried to upgrade a couple of weeks ago. It's also complaining that there's no module named 'debian'

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: update-notifier-common 3.168.3
ProcVersionSignature: Ubuntu 4.4.0-70.91-generic 4.4.49
Uname: Linux 4.4.0-70-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Fri Mar 24 07:56:30 2017
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-08-11 (591 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.20
SourcePackage: update-notifier
Title: package update-notifier-common 3.168.3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)