[Bug 2038915] Re: Don't ask debconf question when upgrading grub on cloud images

[Steve Langasek]

How far back are images affected by this?  It is not a new thing that we
will have updates to grub packages in the security pocket that need to
be applied.  Is this a mantic-specific regression, and should changes be
made to the grub package to work around it for existing images?

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Title:
  Don't ask debconf question when upgrading grub on cloud images

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  [ Impact ]
  cloud images show a debconf prompt (see attachment) when upgrading some grub packages (eg. grub-efi-amd64-signed). That's because the debconf entries are set wrongly during image build to:

  # debconf-show grub-pc | grep grub-efi/install_devices
    grub-efi/install_devices_disks_changed: /dev/disk/by-id/dm-name-loop3p15, /dev/disk/by-id/dm-name-loop3p15
  * grub-efi/install_devices: /dev/disk/by-id/dm-name-loop3p15, /dev/disk/by-id/dm-name-loop3p15
    grub-efi/install_devices_failed: false
    grub-efi/install_devices_empty: false

  
  Upgrade of the packages leads to a prompt for users or automation which should be avoided

  [ Test Plan ]
  * build image
  * check debconf-show grub-pc and check that "grub-efi/install_devices_disks_changed", and "grub-efi/install_devices" are both empty and both unseen.

  [ Where problems could occur ]
  -

  [ Other Info ]

  Reproducer on AWS is:

  - AWS_DEFAULT_REGION=us-east-1 aws ec2 run-instances --image-id ami-0d6c64aedaee5f74f --instance-type m6a.large --key-name toabctl
  - apt update && apt upgrade

  now the prompt is visible.

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