firstboot script hangs if image contains already kernel 6.1

[KwadFan]

Hey there,

Please forgive me if my english isn't the best, I am no native english speaker.

I am one of the MainsailOS maintainers and some users reported an Issu that our latest Image hangs on the first boot while Generating SSH Keys ... is running.

After a bit of research I identified the root cause in the fix_partuuid function of first boot script.
To come them by I commented out the whiptail lines and added set -ex to see whats going on.

As you can see it struggles to do the step. I waited for around 20minutes on a Pi Zero 2 W without being successful.

To prove the issue please use our latest image using rpi-imager.

As proof of concept for that script you can use an artifact of my patched version from here:

https://github.com/mainsail-crew/MainsailOS/actions/runs/4515245620

But I think you can also reproduce it with pi-gen using the latest kernel instead of kernel 5.15y which is currently shipped in rpi-imager

I will open a PR on that, to prevent you are running into that issue with future releases of Raspberry Pi OS.

Regards Kwad