package backup-manager (not installed) failed to install/upgrade: installed backup-manager package post-installation script subprocess returned error exit status 10

[Mike M. Robinson]

This happened after canceling the installation and purging packages on the system.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: backup-manager (not installed)
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.4
AptOrdering:
 backup-manager:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
Date: Sat Oct 6 08:50:04 2018
ErrorMessage: installed backup-manager package post-installation script subprocess returned error exit status 10
InstallationDate: Installed on 2018-09-25 (10 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
Python3Details: /usr/bin/python3.6, Python 3.6.6, 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 1.6.3ubuntu0.1
SourcePackage: backup-manager
Title: package backup-manager (not installed) failed to install/upgrade: installed backup-manager package post-installation script subprocess returned error exit status 10
UpgradeStatus: No upgrade log present (probably fresh install)