This looks to be a local issue:

insserv: warning: script 'K20.depend.boot' missing LSB tags and overrides
insserv: warning: script 'K20.depend.start' missing LSB tags and overrides
insserv: There is a loop at service plymouth if started
insserv: There is a loop between service plymouth and procps if started
insserv:  loop involving service procps at depth 2
insserv:  loop involving service udev at depth 1
insserv: There is a loop between service .depend.boot and plymouth if started
insserv:  loop involving service plymouth at depth 2
insserv:  loop involving service .depend.boot at depth 1
insserv:  loop involving service rsyslog at depth 1
insserv: Starting .depend.boot depends on plymouth and therefore on system 
facility `$all' which can not be true!
...
insserv: Max recursions depth 99 reached
insserv:  loop involving service networking at depth 4
insserv: There is a loop between service plymouth and urandom if started
insserv:  loop involving service urandom at depth 4
insserv:  loop involving service hwclock at depth 3
insserv: There is a loop between service .depend.boot and mountkernfs if started
insserv:  loop involving service mountkernfs at depth 1
insserv: There is a loop between service .depend.boot and dns-clean if started
insserv:  loop involving service dns-clean at depth 1
insserv: exiting now without changing boot order!
update-rc.d: error: insserv rejected the script header
dpkg: error processing package ufw (--purge):
 subprocess installed post-removal script returned error exit status 1

This loop doesn't seem to have anything to do with ufw. Closing for now,
but feel free to reopen if you have specific instructions on how to
reproduce with the ufw deb.

Thanks!

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

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https://bugs.launchpad.net/bugs/1661809

Title:
  failed to install/upgrade: subprocess installed post-removal script
  returned error exit status 1

Status in ufw package in Ubuntu:
  Invalid

Bug description:
  I purged ufw from the system. systemctl list-unit-files showed UFW
  enabled.

  
  The reason I noticed was firewalld is not starting on boot, firewalld.service 
is running and it loads inactive.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: ufw (not installed)
  ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
  Uname: Linux 4.4.0-62-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  AptOrdering:
   ufw: Purge
   NULL: ConfigurePending
  Architecture: amd64
  Date: Sat Feb  4 00:04:25 2017
  ErrorMessage: subprocess installed post-removal script returned error exit 
status 1
  InstallationDate: Installed on 2016-09-25 (131 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.19
  SourcePackage: ufw
  Title: package ufw (not installed) failed to install/upgrade: subprocess 
installed post-removal script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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