This looks to be a local system issue with python3-minimal being removed
and then the prerm scripts from various programs failing due to
debhelper scripts that the package use can't find the required binaries.

Removing python3.6-minimal (3.6.8-1~16.04.york1) ...
Unlinking and removing bytecode for runtime python3.6
Removing qml-module-io-thp-pyotherside:amd64 (1.4.0-2) ...
Removing ubuntu-minimal (1.361) ...
Removing ubuntu-system-service (0.3) ...
/var/lib/dpkg/info/ubuntu-system-service.prerm: 6: 
/var/lib/dpkg/info/ubuntu-system-service.prerm: py3clean: not found
dpkg: error processing package ubuntu-system-service (--remove):
 subprocess installed pre-removal script returned error exit status 127
/var/lib/dpkg/info/ubuntu-system-service.postinst: 6: 
/var/lib/dpkg/info/ubuntu-system-service.postinst: py3compile: not found
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 127
Removing ufw (0.35-0ubuntu2) ...
Skip stopping firewall: ufw (not enabled)
/var/lib/dpkg/info/ufw.prerm: 15: /var/lib/dpkg/info/ufw.prerm: py3clean: not 
found
dpkg: error processing package ufw (--remove):
 subprocess installed pre-removal script returned error exit status 127

I'm not sure how you got into this state (I see a 3.6.8-1~16.04.york1
python3.6-minimal package being removed-- it is possible the ppa in
question has packages that don't have their dependencies setup). I
suggest installing 'python3-minimal' then running 'sudo apt-get -f
install' and then remove any packages you aren't interested in.

** Changed in: ufw (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1836722

Title:
  package ufw 0.35-0ubuntu2 failed to install/upgrade: subprocess
  installed pre-removal script returned error exit status 127

Status in ufw package in Ubuntu:
  Invalid

Bug description:
  Not able to use system. pip crashed.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: ufw 0.35-0ubuntu2
  ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
  Uname: Linux 4.8.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.19
  Architecture: amd64
  Date: Tue Jul 16 14:33:11 2019
  ErrorMessage: subprocess installed pre-removal script returned error exit 
status 127
  InstallationDate: Installed on 2019-07-10 (5 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
  PackageArchitecture: all
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.5
   apt  1.2.32
  SourcePackage: ufw
  Title: package ufw 0.35-0ubuntu2 failed to install/upgrade: subprocess 
installed pre-removal script returned error exit status 127
  UpgradeStatus: No upgrade log present (probably fresh install)

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