Comment 6 for bug 1619844

Journal ends with:
Sep 02 23:59:22 nuc systemd-shutdown[1]: Sending SIGTERM to remaining processes...
Sep 02 23:59:22 nuc systemd-journald[1455]: Journal stopped

which means that something is not dieing and we are not getting any more logs recorded.....

and it indicates that all/most attempts to reboot have been exhausted and possibly it is the firmware/bios itself that are failing to reboot/shutdown the machine.

What are exact model details of the affected machines? maybe we can find same/similar in the validation lab and check if they pass Ubuntu certification.