[Bug 1876974] Re: Support multiple ESPs

[Johan Ehnberg]

I ran 'grub-install', and expected both efi to be updated. It updates
only the primary ESP.

Both 'dpkg-reconfigure grub-efi-amd64' and running 'grub-multi-install'
directly update both ESPs. So on the package updates part it looks like
we are good to go.

The part that I am missing, is making it somehow the default out of the box action for admins when updating efi on such systems. Here are some approaches to illustrate:
- put grub-multi-install in the path at the very least,
- use dpkg's alternatives to point grub-install at grub-multi-install or
- wrap grub-install with a warning if multiple ESP's are present,
- put a note somewhere where admins will be looking when trying to figure it out, such as on /boot/efi if the specs allow it

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https://bugs.launchpad.net/bugs/1876974

Title:
  Support multiple ESPs

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  Subiquity has the brilliant feature of supporting installing to
  multiple ESP's. See https://bugs.launchpad.net/subiquity/+bug/1817066
  for details.

  grub-install does not mirror this feature this out of the box, but
  updates the ESP on /boot/efi only by default on such an installation.
  Whenever efi potentially changes, this leaves the backup ESP without
  the update.

  Adding this support would be coherent, since an admin may logically
  assume the install mode is supported beyond the installation phase.

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