[Bug 1787540] [NEW] 16.04 to 18.04.1 ubgrade fails because of diversion of org.freedesktop.systemd1.service

[MarcS]

Public bug reported:

I ran do-release-upgrade from a terminal. The process eventually failed
because of "too many errors". The root cause appears to be this:

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

I appear to have worked around this by manually removing
/usr/share/dbus-1/system-services/org.freedesktop.systemd1.service,
purging systemd-shim via `dpkg -P` and then doing `apt-get install -f`,
which completed without errors.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1787540

Title:
  16.04 to 18.04.1 ubgrade fails because of diversion of
  org.freedesktop.systemd1.service

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I ran do-release-upgrade from a terminal. The process eventually
  failed because of "too many errors". The root cause appears to be
  this:

  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

  I appear to have worked around this by manually removing
  /usr/share/dbus-1/system-services/org.freedesktop.systemd1.service,
  purging systemd-shim via `dpkg -P` and then doing `apt-get install
  -f`, which completed without errors.

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