Is it possible the 22.04 install was setup using legacy dm-raid format?
The legacy dm-raid format does not include a header so it looks like a
raw ext2 to grub and it can "embed" there (as it will see the ext2 on
either disk at boot).
Anyway, reassigning to subiquity for triaging.
** Also affects: subiquity
Importance: Undecided
Status: New
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2060695
Title:
24.04 grub-pc cannot upgrade on mirrored software RAID root disk
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