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

[Michael Hudson-Doyle]

You are correct that subiquity does not allow you to put the ESP on a
metadata 1.2 MD RAID device. That's because, to the best of my
knowledge, almost all firmware does not know about MD RAID formats and
so would be unable to boot the system.

The question thus becomes, how can the installer know that putting the
ESP on a metadata 1.2 MD RAID is going to work? I presume we can
identify your firmware by looking at sysfs somehow or other?

I still wouldn't be amazingly happy about doing this because it is a
general goal of Ubuntu's installers that you can transfer a disk between
systems and still have it boot, but that's probably not so important for
the server use case.

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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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