[Bug 1831631] Re: grub should be pre-installed on images

[Steve Langasek]

Pros:
 - installing them in the squashfs is faster than installing them at build time
 - if we believe they should always be installed, it simplifies the installer logic
   - except that we're also converging on a single installer code base, so it doesn't simplify things too much to have it in livecd-rootfs instead of in curtin (and curtin still has to trigger grub-install to the target disks, either by replaying the package postinsts on the target or by manually calling grub-install)

Cons:
 - this moves us farther away from being able to converge the server squashfs as used by subiquity with the lxd squashfs published by cloud images.  (we don't currently have a path forward for how to build this once and consume it in both places, but nevertheless I don't like that we currently build it twice.)

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Title:
  grub should be pre-installed on images

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  given that grub are now co-installable by default, shouldn't they be
  preinstalled in the squashfs?

  it seems like grub-efi-amd64-bin & signed are not in the squashfs.

  I guess that affects all of ubiquity & subiquity images.

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