[Bug 2017209] Re: [Raspberry Pi/lunar] systemd-oomd fails with "ConditionControlGroupController=memory was not met"

[fprietog]

The file /etc/apt/preferences.d/proposed-updates didn't exists in my
system. I've created it with your content and proposed updates now are
working.

But, AFAIK, I've never needed to pin proposed updates repo to make it
work until now (?)

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https://bugs.launchpad.net/bugs/2017209

Title:
  [Raspberry Pi/lunar] systemd-oomd fails with
  "ConditionControlGroupController=memory was not met"

Status in linux-raspi package in Ubuntu:
  Fix Committed
Status in systemd package in Ubuntu:
  Invalid
Status in linux-raspi source package in Lunar:
  Fix Committed
Status in systemd source package in Lunar:
  Invalid

Bug description:
  PROBLEM SUMMARY:
  ----------------
  Just upgraded to Ubuntu 23.04 (lunar) from Ubuntu 22.10 (kinetic). systemd-oomd fails with "ConditionControlGroupController=memory was not met" during boot. 
  If you manually started it after boot it starts but after a few minutes it fails with the same error.

  These are the journalctl entries regarding this problem:

  abr 20 23:12:48 fpgrpi systemd[1]: Listening on systemd-oomd.socket - Userspace Out-Of-Memory (OOM) Killer Socket.
  abr 20 23:12:48 fpgrpi systemd[1]: systemd-oomd.service - Userspace Out-Of-Memory (OOM) Killer was skipped because of an unmet condition check (ConditionControlGroupController=memory).
  --- Line repeat 20 times ---
  abr 20 23:12:49 fpgrpi systemd[1]: systemd-oomd.service - Userspace Out-Of-Memory (OOM) Killer was skipped because of an unmet condition check (ConditionControlGroupController=memory).
  abr 20 23:12:49 fpgrpi systemd[1]: systemd-oomd.socket: Trigger limit hit, refusing further activation.
  abr 20 23:12:49 fpgrpi systemd[1]: systemd-oomd.socket: Failed with result 'trigger-limit-hit'.

  
  This is the systemctl status for systemd-oomd.service and systemd-oomd.socket:

  # systemctl status systemd-oomd.service
  ○ systemd-oomd.service - Userspace Out-Of-Memory (OOM) Killer
       Loaded: loaded (/lib/systemd/system/systemd-oomd.service; enabled; preset: enabled)
       Active: inactive (dead)
  TriggeredBy: × systemd-oomd.socket
    Condition: start condition failed at Thu 2023-04-20 23:21:07 CEST; 9h ago
               └─ ConditionControlGroupController=memory was not met
         Docs: man:systemd-oomd.service(8)

  # systemctl status systemd-oomd.socket
  × systemd-oomd.socket - Userspace Out-Of-Memory (OOM) Killer Socket
       Loaded: loaded (/lib/systemd/system/systemd-oomd.socket; enabled; preset: enabled)
       Active: failed (Result: trigger-limit-hit) since Thu 2023-04-20 23:21:07 CEST; 9h ago
     Duration: 2min 2.252s
     Triggers: ● systemd-oomd.service
         Docs: man:systemd-oomd.service(8)
       Listen: /run/systemd/oom/io.system.ManagedOOM (Stream)

  
  ADITIONAL INFO:
  ---------------
  Machine is an arm64 "Raspberry Pi 4 Model B Rev 1.4 8GB"

  # uname -a
  Linux fpgrpi 6.2.0-1004-raspi #5-Ubuntu SMP PREEMPT Mon Apr  3 11:15:14 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

  # lsb_release -rd
  No LSB modules are available.
  Description:	Ubuntu 23.04
  Release:	23.04

  # apt-cache policy systemd-oomd
  systemd-oomd:
    Instalados: 252.5-2ubuntu3
    Candidato:  252.5-2ubuntu3
    Tabla de versión:
   *** 252.5-2ubuntu3 500
          500 http://ports.ubuntu.com/ubuntu-ports lunar/main arm64 Packages
          100 /var/lib/dpkg/status

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