On 13/09/2025 at 12:51, Debian wrote:
Am 13.09.25 um 10:55 schrieb Pascal Hambourg:
I do not see any such entry in grub.cfg in your initial report.
Copied from the initial report:
Again, I do not see any line "linux /vmlinuz root=/dev/sda2" here.
Can you attach the full contents of /boot/grub/grub.cfg in Debian 12
root filesytem ?
This is a bug for Debian 13 and not for Debian 12.
This could be a bug in parsing menu entries from the foreign grub.cfg.
The error occurs after the upgrade when grub has been installed in
Debian 13.
Which upgrade ?
It seems to be confusing for you. :-)
(...)
Debian 12 is installed in /dev/sdb2 and has been copied to /dev/sdb5.
How was I supposed to know about that ?
It was not easy to boot the copy in /dev/sdb5
If you used os-prober to generate menu entries for the copy, the
grub.cfg copy originally contained the wrong UUID in the kernel command
line and os-prober imported them, so the generated menu entries actually
mounted the original root partition.
