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["Jason M." <jason-ubuntu@xxxxxxxxx>]

Similar experience on a DO instance.  Initial do-release-upgrade failure
due to bug #1793932: exim4 deprecated conffile issue.  Now recovery is
systemd-shim (9-1bzr4ubuntu1) blocked. @digitalcircuit's 2018-06-10
suggestion above did not work for me.  Will restore 16.04 and try again
later.

Details:
$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  cgmanager libcryptsetup4 rename
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  debconf debconf-i18n exim4-base exim4-daemon-heavy libapparmor-perl libgdbm-compat4 libgdbm5 libhtml-parser-perl
  liblocale-gettext-perl libmailutils5 libnet-ssleay-perl libpam-systemd libperl5.26 libreadline7 libsocket6-perl libssl1.1
  libtext-charwidth-perl libtext-iconv-perl networkd-dispatcher perl perl-base perl-modules-5.26 perl-openssl-defaults
  systemd
Suggested packages:
  debconf-doc debconf-utils libterm-readline-gnu-perl libgtk3-perl libnet-ldap-perl libqtgui4-perl libqtcore4-perl eximon4
  exim4-doc-html | exim4-doc-info spf-tools-perl swaks gdbm-l10n libdata-dump-perl perl-doc libterm-readline-gnu-perl
  | libterm-readline-perl-perl systemd-container policykit-1
The following packages will be REMOVED:
  libperl5.22 perl-modules-5.22 systemd-shim
The following NEW packages will be installed:
  libgdbm-compat4 libgdbm5 libmailutils5 libperl5.26 libreadline7 libssl1.1 networkd-dispatcher perl-modules-5.26
  perl-openssl-defaults
The following packages will be upgraded:
  debconf debconf-i18n exim4-base exim4-daemon-heavy libapparmor-perl libhtml-parser-perl liblocale-gettext-perl
  libnet-ssleay-perl libpam-systemd libsocket6-perl libtext-charwidth-perl libtext-iconv-perl perl perl-base systemd
15 upgraded, 9 newly installed, 3 to remove and 389 not upgraded.
3 not fully installed or removed.
Need to get 0 B/14.9 MB of archives.
After this operation, 3,000 kB of additional disk space will be used.
Do you want to continue? [Y/n]
Preconfiguring packages ...
(Reading database ... 97832 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

-- 
You received this bug notification because you are a member of DX
Packages, which is subscribed to systemd-shim in Ubuntu.
https://bugs.launchpad.net/bugs/1773859

Title:
  upgrades to 18.04 fail

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd-shim package in Ubuntu:
  Won't Fix
Status in systemd source package in Bionic:
  Fix Committed
Status in systemd-shim source package in Bionic:
  Won't Fix
Status in systemd source package in Cosmic:
  Fix Released
Status in systemd-shim source package in Cosmic:
  Won't Fix

Bug description:
  [Impact]

   * Some systems fail to upgrade due to conflicts between systemd and
  the (now removed from the archive) systemd-shim / upstart.

   * Instead of trying to work out what's the problem in ordering /
  removal of diverts, ensure that systemd is never unpacked whilst
  systemd-shim/upstart are still on disk. Thus declare conflicts against
  systemd-shim/upstart packages in systemd package.

  [Test Case]

   * monitor drop-off of upgrades with below reported problem

   * Check that it is possible to upgrade to bionic's libpam-systemd
  from xenial with systemd-shim installed on xenial.

  [Regression Potential]

   * systemd-shim/upstart are both removed and not supported in bionic,
  thus forcing their removal via conflicts should bring the system into
  an expected state.

  [Other Info]
   
   * original bug report

  
  $ 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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