Comment 29 for bug 1848797

Before the upgrade debconf-show grup-pc output (on Ubuntu 19.04) is:

debconf-show grub-pc
  grub-pc/install_devices_failed_upgrade: true
  grub2/device_map_regenerated:
  grub2/unsigned_kernels:
  grub-pc/install_devices_empty: false
  grub2/kfreebsd_cmdline_default: quiet splash
  grub-pc/chainload_from_menu.lst: true
  grub-pc/install_devices_failed: false
  grub-pc/hidden_timeout: false
  grub2/kfreebsd_cmdline:
  grub2/linux_cmdline_default: nomodeset elevator=noop
  grub2/force_efi_extra_removable: false
  grub2/unsigned_kernels_title:
  grub2/linux_cmdline:
* grub-pc/install_devices: /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-0-part1
  grub-pc/timeout: 3
  grub2/update_nvram: true
  grub-pc/postrm_purge_boot_grub: false
  grub-pc/disk_description:
  grub2/no_efi_extra_removable: false
  grub-pc/kopt_extracted: false
* grub-pc/install_devices_disks_changed: /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-0-part1
  grub-pc/partition_description:
  grub-pc/mixed_legacy_and_grub2: true