systemd now correctly conflicts with systemd-shim, and installing both simultaniously is now even harder:
$ sudo apt install systemd-shim Reading package lists... Done Building dependency tree Reading state information... Done The following package was automatically installed and is no longer required: python3-netifaces Use 'sudo apt autoremove' to remove it. The following additional packages will be installed: cgmanager cgroup-lite libcgmanager0 libnih-dbus1 Suggested packages: pm-utils The following packages will be REMOVED: cloud-init friendly-recovery init libnss-systemd libpam-systemd netplan.io nplan plymouth plymouth-theme-ubuntu-text policykit-1 snapd systemd systemd-sysv ubuntu-minimal ubuntu-standard The following NEW packages will be installed: cgmanager cgroup-lite libcgmanager0 libnih-dbus1 systemd-shim WARNING: The following essential packages will be removed. This should NOT be done unless you know exactly what you are doing! init systemd-sysv (due to init) 0 upgraded, 5 newly installed, 15 to remove and 0 not upgraded. Need to get 147 kB of archives. After this operation, 77.6 MB disk space will be freed. You are about to do something potentially harmful. To continue type in the phrase 'Yes, do as I say!' ?] ^C ubuntu@ubuntu:~$ dpkg-query -W systemd systemd 237-3ubuntu10.10 Thus it should also cause removal of systemd-shim on upgrades. Marking as validation done. ** Tags removed: verification-needed verification-needed-bionic ** Tags added: verification-done verification-done-bionic -- 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, ie. lxc launch ubuntu-daily:xenial test-shim-upgrade lxc exec test-shim-upgrade apt update apt install systemd-shim wget https://deb.debian.org/debian/pool/main/s/systemd-shim/systemd-shim_10-3_amd64.deb apt install ./systemd-shim_10-3_amd64.deb sed 's/xenial/bionic/' -i /etc/apt/sources.list apt update apt install systemd this currently passes, however, systemd-shim remains installed. It should be removed instead. Apt install systemd should have lines like this: The following packages will be REMOVED: systemd-shim ... 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' ... [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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