[Bug 1962036] Re: dbus was stopped during today's jammy update, breaking desktop

[Dave Jones]

Some additional info:

"dh_installsystemd --no-start" on its own is *not* equivalent to "--no-
start --restart-after-upgrade" as one might imagine ("--restart-after-
upgrade" is *usually* the dh_installsystemd default). Instead "--no-
start" adjusts the restart default to "--no-restart-after-upgrade" (I'm
now *fairly* convinced this is actually a bug). Unfortunately "--no-
restart-after-upgrade" cannot work with "--no-start" because, whilst the
preinst script will always stop the service, the postinst script won't
attempt to start it again because "--no-start" is specified.

Even if dh_installsystemd did try to be more intelligent, I'm not
convinced this combination can ever work in all circumstances: the
postinst maintscript cannot know whether the service was running prior
to the preinst script stopping it because the idempotency requirement
for maintscripts implies that postinst is not necessarily running
immediately after preinst.

In other words, "--no-start --no-restart-after-upgrade" (or "--no-start"
on its own which is equivalent) is a broken combination which does not
(and probably cannot, at least with the current design) work.

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https://bugs.launchpad.net/bugs/1962036

Title:
  dbus was stopped during today's jammy update, breaking desktop

Status in dbus package in Ubuntu:
  Triaged
Status in dbus source package in Jammy:
  Triaged

Bug description:
  Impact: logind stopped, so desktop stopped, ssh stopped, got no getty.
  Had to hard reset.

  Today's jammy upgrade stopped dbus at 19:46:27

  Feb 23 19:46:27 jak-t480s systemd[1]: Stopping D-Bus System Message
  Bus...

  This should not happen. I don't know which package caused this, but
  presumably dbus should not be stoppable in the first place.


  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: dbus 1.12.20-2ubuntu3
  ProcVersionSignature: Ubuntu 5.15.0-22.22-generic 5.15.19
  Uname: Linux 5.15.0-22-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu78
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: GNOME
  Date: Wed Feb 23 20:03:41 2022
  InstallationDate: Installed on 2018-03-14 (1442 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180313)
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: dbus
  UpgradeStatus: No upgrade log present (probably fresh install)

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