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

[Matthieu Clemenceau]

** Tags removed: rls-gg-incoming

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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 Focal:
  Triaged
Status in grub2 source package in Groovy:
  Triaged

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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