It looks like the installer is actually doing the correct thing, but then upon first boot the debconf magically contains a different value.
Currently suspecting cloud-init ** Also affects: cloud-init (Ubuntu) Importance: Undecided Status: New ** Changed in: subiquity Status: New => Invalid ** Changed in: subiquity Importance: High => Undecided -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2060695 Title: 24.04 grub-pc cannot upgrade on mirrored software RAID root disk To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/2060695/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs