[Bug 1773859] Re: upgrades to 18.04 fail

[Dimitri John Ledkov]

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 at 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

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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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