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

[Sujith Pandel]

Description of the feature request:

The DellEMC PowerEdge RAID Controller(PERC) S130/S140 is RAID solution
for the DellEMC PowerEdge systems configured through Chipset SATA
controller. It does not use any dedicated Hardware for RAID operations.
It is set up/configured by the system BIOS. Using the BIOS/UEFI
Configuration utility user can configure RAID on onboard SATA/NVMe
Drives and install OS and boot from it.

To make use of S130/S140 solution, the user need to change the SATA mode to RAID in BIOS/UEFI Configuration.
During S130/S140 configuration, the VDs (Virtual Disk) are created by system BIOS by writing metadata on the selected onboard SATA or NVMe drives. The metadata format used is MD version 1.2. The resulting VD is a Linux MDRAID VD.

This is the feature that we are requesting - to get install and boot
support for Ubuntu 22.04 and future releases of Ubuntu 20.04

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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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