[Bug 1756755] Re: package systemd-sysv 237-3ubuntu4 failed to install/upgrade: installed systemd-shim package post-removal script subprocess returned error exit status 2

[xor]

I am also affected and I did not manually install systemd-shim and did
not tamper with upstart.

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Title:
  package systemd-sysv 237-3ubuntu4 failed to install/upgrade: installed
  systemd-shim package post-removal script subprocess returned error
  exit status 2

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Upgrading from xenial to bionic failed the removal of systemd-shim.
  I think the messages were the same as the following, that I can reproduce by running "apt upgrade" from the upgraded system:

  Removing systemd-shim (9-1bzr4ubuntu1) ...
  Removing 'diversion of /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service to /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service.systemd by systemd-shim'
  dpkg-divert: error: rename involves overwriting '/usr/share/dbus-1/system-services/org.freedesktop.systemd1.service' with
    different file '/usr/share/dbus-1/system-services/org.freedesktop.systemd1.service.systemd', not allowed
  dpkg: error processing package systemd-shim (--remove):
   installed systemd-shim package post-removal script subprocess returned error exit status 2
  Errors were encountered while processing:
   systemd-shim
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: systemd-sysv 237-3ubuntu4
  ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
  Uname: Linux 4.15.0-12-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  Date: Sun Mar 18 22:52:00 2018
  ErrorMessage: installed systemd-shim package post-removal script subprocess returned error exit status 2
  InstallationDate: Installed on 2013-01-11 (1892 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  Python3Details: /usr/bin/python3.6, Python 3.6.5rc1, python3-minimal, 3.6.4-1
  PythonDetails: /usr/bin/python2.7, Python 2.7.14+, python-minimal, 2.7.14-4
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu1
   apt  1.6~beta1
  SourcePackage: systemd
  Title: package systemd-sysv 237-3ubuntu4 failed to install/upgrade: installed systemd-shim package post-removal script subprocess returned error exit status 2
  UpgradeStatus: Upgraded to bionic on 2018-03-18 (0 days ago)

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