[Bug 1899462] Re: grub2, cannot upgrade due to EFI partition type mismatch

[Mate Kukri]

Since this is ESP on MBR only problem (which isn't exactly a thing we do
nowdays), I don't think SRU-ing this is worth it, but I'll look at
whether or not Oracular still needs this fixed.

** Changed in: grub2 (Ubuntu)
   Importance: High => Low

** Changed in: grub2 (Ubuntu)
     Assignee: Julian Andres Klode (juliank) => Mate Kukri (mkukri)

** No longer affects: grub2 (Ubuntu Focal)

** Tags added: foundations-todo

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Title:
  grub2, cannot upgrade due to EFI partition type mismatch

Status in grub2 package in Ubuntu:
  Triaged
Status in grub2 source package in Groovy:
  Won't Fix

Bug description:
  grub2, when looking for suitable ESPs, only looks at MBR partitions
  with id 0xef. However, systems do boot from other vfat partitions too,
  in this case, a 0xb partition.

  Now, if the ESPs were changed while upgrading, the prompt to select
  ESPs will not be shown and the upgrade will fail; because no ESPs are
  considered valid and hences CHOICES is empty.

  
  IRC discussion: https://irclogs.ubuntu.com/2020/10/12/%23ubuntu-devel.html

  Trace log: Attached
  Workaround: Change partition type of /boot/efi or other ESPs from 0xb (in this concrete example) to 0xef

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