Just to keep you informed:
/var/log/smbd was missing, too. But during boot, there is no error coming up! Taking a look with journalctl was showing me this problem.
So i was able to create the missing folder again....
Do you have any advice, how to clear all generated logs (and log-rotates) on the system? This may be a solution for getting rid of the nginx
error, with the old flashmemory plugin. I installed it again (Now it´s working without nginx boot error logging).
This strange Linux thing:
Mär 16 09:57:57 pr-srv-01 kernel: ERST: Failed to get Error Log Address Range.
......
Mär 16 09:57:57 pr-srv-01 kernel: APEI: Can not request [mem 0xbff9a740-0xbff9a793] for APEI BERT registers
I surfed around a lot...
With my stupid understanding: Linux system is trying to report an system error to permanent ACPI Database, that isn´t present on this
system/BIOS... Linux system should clear this (don´t know, at what time, state or how).... Ok my system is very old...
6.12.x kernel is throwing CPU warnings during boot i´m not seeing with 6.1.x stable kernel... (May be normal due old hardware)
But i had no bootup errors with both kernels before the 03/15/2025 (and i´m not taking a look with journalctl before).
Solutions offered:
- Ignore!
- Disable ACPI with command "acpi=off" in boot grub 2 (I guess, not a good solution)
At this time, i guess: There must be a solution for kernel/system ERST error logging. They must be saved permanent anywhere!? It´s not in BIOS.
I will try do a clean new installation of OMV... Taking a look, if errors will go away. Need some time for this...
I don´t want to bother you with this stuff, because it´s a kernel/system specific problem...
But i´m still learning all the necessary Linux stuff at this time... But this issue is for the experts!
Debugging was one of my skills, when i was working in the past... But my knowledge is not great enough, right now....
(Most people will choose 'Ignore', i´m different... 
)
Best regards
and thanks for all of your work here!
prtigger