This affects dbus, but the last change that could probably have caused
this was in systemd.

** Package changed: dbus (Ubuntu) => systemd (Ubuntu)

** Also affects: dbus (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1917298

Title:
  dbus-daemon not started after reboot

Status in dbus package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  In the past weeks we experienced few systems coming up without started
  dbus-daemon after reboots due to updates.

  The first occurrence happens on January 21th 2021, since this time we
  were experiencing 0 up to 2 machines with this issue on each reboot
  cycle affecting all (approx 20) Ubuntu 20.4 (Focal Fossa) LTS
  machines.

  On January 21th the machines were rebooted due to a kernel update. On
  January 19th there were updates for systemd (systemd:amd64
  245.4-4ubuntu3.4) installed.

  
  The Symptoms seem to be:
  ```
  root@es1:~# systemctl status dbus
  ● dbus.service - D-Bus System Message Bus
       Loaded: loaded (/lib/systemd/system/dbus.service; static; vendor preset: 
enabled)
       Active: inactive (dead)
  TriggeredBy: ● dbus.socket
         Docs: man:dbus-daemon(1)
  ```

  There is no `dbus-daemon` process running any more after reboot.

  The messages in /var/log/syslog:
  ```
  Feb 24 09:21:52 runner1 kernel: [   11.005391] systemd[1]: sockets.target: 
Found ordering cycle on dbus.socket/start
  [...]
  Feb 24 09:21:52 runner1 kernel: [   11.012386] systemd[1]: sockets.target: 
Job dbus.socket/start deleted to break ordering cycle starting with 
sockets.target/start
  ```

  Jounalctl output ends with the dbus-Shutdown before reboot, and it is
  not updated any more.

  
  When rebooting the affected machine again, this does'nt occur again, and the 
dbus-daemon is started and working again. We experienced this on 4 rather 
different machines on 6 reboot cycles across all Ubuntu 20.4 (Focal Fossa) LTS 
machines till now.

  We are not experiencing this on other LTS releases than 20.4.

To manage notifications about this bug go to:
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