[Bug 1817713] [NEW] Grub2 does not detect MD raid (level 1) 1.0 superblocks on 4k block devices

[JulietDeltaGolf]

Public bug reported:

grub-install will fail if the /boot partition is located on a MD raid
device level 1 backed by 4k sectorsize devices, NVMe drives in my case.

Steps to Reproduce:

1°) Create a raid1 with 1.0 superblock with two 4k sectorsize devices
2°) Create a partition for /boot and format it FAT32
3°) Mount /boot
4°) grub-install complains about not be being able to find the mduuid device

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: grub2 (CentOS)
     Importance: Unknown
         Status: Unknown

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https://bugs.launchpad.net/bugs/1817713

Title:
  Grub2 does not detect MD raid (level 1) 1.0 superblocks on 4k block
  devices

Status in grub2 package in Ubuntu:
  New
Status in grub2 package in CentOS:
  Unknown

Bug description:
  grub-install will fail if the /boot partition is located on a MD raid
  device level 1 backed by 4k sectorsize devices, NVMe drives in my
  case.

  Steps to Reproduce:

  1°) Create a raid1 with 1.0 superblock with two 4k sectorsize devices
  2°) Create a partition for /boot and format it FAT32
  3°) Mount /boot
  4°) grub-install complains about not be being able to find the mduuid device

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