I think I have found the cause, although it seems a little odd.
Yesterday the system ended up in the "powered down" state shortly after boot. I
may have booted the wrong kernel.
Anyway I rebooted to the 6.8.0-48-generic kernel and all was OK.
Until my daily backup reported that it couldn't find the backup partition.
Which was odd, as it is on the internal SSD (the NUC has an M2 NVMe and an SDD).
So I shut down and removed the SSD to check it on another system in a
USB caddy (it was fine) then put it back into the NUC.
Now it was found again. Presumably there had been a dodgy connexion (the ribbon
cable connexion to the motherboard?).
So I wondered whether this had been the problem all along and tried booting
6.11.0-13-generic. This now seemed to be OK.
It's still OK today. I'm using it now.
So I'll close this.
An odd bug though to have only affected 6.9+ kernels, when 6.8, and MS
Windows was OK. (And btrfs scrub *before* I reset the connexion
consistently ran at 445MiB/s).
** Changed in: linux (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2087333
Title:
kernel 6.11.0-9-generic stops on Intel i3-1315U NUC
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