[Bug 1773859] [NEW] upgrades to 18.04 fail

[Kees Cook]

Public bug reported:

$ sudo apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be REMOVED:
  systemd-shim
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 71.7 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 632222 files and directories currently installed.)
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):
 subprocess installed post-removal script returned error exit status 2
Errors were encountered while processing:
 systemd-shim
E: Sub-process /usr/bin/dpkg returned an error code (1)

Commenting out the dpkg-divert in systemd-shim's postrm solved this for
me and I was about to continue the upgrade.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd-shim (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Affects: systemd-shim (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: systemd (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: systemd-shim (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1773859

Title:
  upgrades to 18.04 fail

Status in systemd package in Ubuntu:
  New
Status in systemd-shim package in Ubuntu:
  New
Status in systemd source package in Bionic:
  New
Status in systemd-shim source package in Bionic:
  New

Bug description:
  $ sudo apt upgrade
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Calculating upgrade... Done
  The following packages will be REMOVED:
    systemd-shim
  0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
  1 not fully installed or removed.
  After this operation, 71.7 kB disk space will be freed.
  Do you want to continue? [Y/n] y
  (Reading database ... 632222 files and directories currently installed.)
  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):
   subprocess installed post-removal script returned error exit status 2
  Errors were encountered while processing:
   systemd-shim
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  Commenting out the dpkg-divert in systemd-shim's postrm solved this
  for me and I was about to continue the upgrade.

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