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 Ubuntu Touch seeded packages, which is subscribed to systemd 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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