package mailman3 3.1.1-9 failed to install/upgrade: installed mailman3 package post-installation script subprocess returned error exit status 1

[John Richardson]

Was only installing packages for python3 using Synaptic and did not have mysql installed. Tried to deselect the configs during install and the install failed.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: mailman3 3.1.1-9
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Sat Apr 28 12:53:45 2018
ErrorMessage: installed mailman3 package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-04-28 (0 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: mailman3
Title: package mailman3 3.1.1-9 failed to install/upgrade: installed mailman3 package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)