[Merge] ~ubuntu-core-dev/grub/+git/ubuntu:wip/postinst-check into ~ubuntu-core-dev/grub/+git/ubuntu:focal

[Dimitri John Ledkov]

Dimitri John Ledkov has proposed merging ~ubuntu-core-dev/grub/+git/ubuntu:wip/postinst-check into ~ubuntu-core-dev/grub/+git/ubuntu:focal.

Commit message:
grub-pc/postinst: fail noninteractive installation if devices failed to install

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1889556 in grub2 (Ubuntu): "grub-install failure does not fail package upgrade (and does not roll back to matching modules)"
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1889556

For more details, see:
https://code.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/+merge/388432
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~ubuntu-core-dev/grub/+git/ubuntu:wip/postinst-check into ~ubuntu-core-dev/grub/+git/ubuntu:focal.
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