Public bug reported:
When the grub-ieee1275 package is installed or upgraded the grub-
ieee1275.postinst script uses the prep-bootdev helper to find a PReP
partition to install grub to via grub-install. When there is a single
PReP partition on the system this is fine, however when more than one is
present it's difficult to tell which one prep-bootdev will pick, and if
it will always pick the same one.
We hit this on a test system where the partition layout is the one in
the attached file. As you can see there are two PReP partitions:
Device Start End Sectors Size Type
/dev/vda4 10487808 10504191 16384 8M PowerPC PReP boot
Device Start End Sectors Size Type
/dev/vde2 2099200 2115583 16384 8M PowerPC PReP boot
In this case prep-bootdev chose /dev/vde2 to install grub to. This was
unexpected.
I don't have a sensible alternative to propose here, as we want to keep
grub guessing what is reasonable to guess and we don't want to break
existing systems or workflows. Still the current behavior is less than
ideal.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1843288
Title:
grub-ieee1275 installs to an arbitrary PReP partition when more than
one is available
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