[Bug 1961079] Re: [Ubuntu 22.04] Allow ESP installation on md-disks in subiquity

[Sujith Pandel]

Steps:
1. Setup a DellEMC 14G PE server with 2 Onboard SATA disks.
2. Setup a md-raid (RAID1) on these SATA disks through BIOS S140 controller in UEFI mode.
3. Start installing Ubuntu 22.04
4. See that user cannot select md-raid disk as boot disk. Installation on md-raid disk cannot proceed.

** Attachment added: "md-raid disk is not listed in subiquity"
   https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1961079/+attachment/5561523/+files/ubuntu-1.PNG

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https://bugs.launchpad.net/bugs/1961079

Title:
  [Ubuntu 22.04] Allow ESP installation on md-disks in subiquity

Status in grub2 package in Ubuntu:
  Incomplete
Status in subiquity package in Ubuntu:
  New
Status in grub2 source package in Focal:
  New
Status in subiquity source package in Focal:
  New
Status in grub2 source package in Jammy:
  Incomplete
Status in subiquity source package in Jammy:
  New

Bug description:
  subiquity installer currently does not allow to select md-disk as Installation destination where /, /home and /boot/efi could be created and installed. 
  Request is to enable this feature so that we can install and boot from md-disk, which our BIOS creates.

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