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

[Sujith Pandel]

I believe the code changes has to go to these files:
https://github.com/canonical/subiquity/blob/main/subiquity/common/filesystem/boot.py
and
https://github.com/canonical/subiquity/blob/main/subiquity/common/filesystem/actions.py

Currently it allows only imsm containers and hence our md-raid 1.2 disks
aren't being considered as Boot drive candidate.

What kind of subiquity quirk do you propose to enable Linux md-raid 1.2
disks?

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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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