package unity-tweak-tool 0.0.7ubuntu2 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 127

[William A Pittman]

I think I broke it trying to upgrade to Python 3.6.1

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: unity-tweak-tool 0.0.7ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-83.106-generic 4.4.70
Uname: Linux 4.4.0-83-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.4
AptOrdering:
 unity-tweak-tool: Purge
 NULL: ConfigurePending
Architecture: amd64
Date: Sun Jul 9 14:24:59 2017
DpkgTerminalLog:
 Removing unity-tweak-tool (0.0.7ubuntu2) ...
 /var/lib/dpkg/info/unity-tweak-tool.prerm: 6: /var/lib/dpkg/info/unity-tweak-tool.prerm: py3clean: not found
 dpkg: error processing package unity-tweak-tool (--purge):
  subprocess installed pre-removal script returned error exit status 127
DuplicateSignature:
 package:unity-tweak-tool:0.0.7ubuntu2
 Removing unity-tweak-tool (0.0.7ubuntu2) ...
 /var/lib/dpkg/info/unity-tweak-tool.prerm: 6: /var/lib/dpkg/info/unity-tweak-tool.prerm: py3clean: not found
 dpkg: error processing package unity-tweak-tool (--purge):
  subprocess installed pre-removal script returned error exit status 127
ErrorMessage: subprocess installed pre-removal script returned error exit status 127
InstallationDate: Installed on 2016-12-29 (192 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.15ubuntu0.2
SourcePackage: unity-tweak-tool
Title: package unity-tweak-tool 0.0.7ubuntu2 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 127
UpgradeStatus: No upgrade log present (probably fresh install)