package python-meld3 1.0.2-2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[David, your friend]

Error occurred after running `sudo apt-get install -y gunicorn supervisor`.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: python-meld3 1.0.2-2
ProcVersionSignature: Ubuntu 4.10.0-27.30~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-27-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Thu Jul 27 13:53:09 2017
Dependencies:

ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-07-10 (16 days ago)
InstallationMedia: Ubuntu-GNOME 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: python-meld3
Title: package python-meld3 1.0.2-2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)