[Bug 1892526] Re: dpkg-reconfigure grub-pc no longer prompts for grub-pc/install_devices

[Steve Langasek]

On Tue, Aug 25, 2020 at 06:25:13PM -0000, Dimitri John Ledkov wrote:
> @vorlon we should ask all these questions if "$1" is "reconfigure", no?

$1 never equals reconfigure.  The check is for DEBCONF_RECONFIGURE in the
environment.

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https://bugs.launchpad.net/bugs/1892526

Title:
  dpkg-reconfigure grub-pc no longer prompts for grub-pc/install_devices

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  I recently had a RAID-5 disk failure and was greeted by an inoperable
  grub due to not having installed grub on all the disks.  I temporarily
  fixed this problem by manually running "grub-install" on the other
  disks in the array and got my system working.

  Previously it was advised to run "dpkg-reconfigure grub-pc" and select
  the relevant disks to ensure that future grub updates installed on all
  the disks in the array.  This command no longer prompts for the
  install disks due to the changed introduced by
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1889556.  In
  /var/lib/dpkg/info/grub-pc.postinst, the following elif block
  immediately precedes the elif block that prompts for grub-
  pc/install_devices and short circuits on all recent grub versions:

    elif dpkg --compare-versions "$2" ge 2.04-1ubuntu26; then
      # Avoid the possibility of breaking grub on SRU update
      # due to ABI change
      :

  I can confirm this issue is present on 20.04.1 and it appears to be
  present on 18.04.4 per https://askubuntu.com/questions/1212569/dpkg-
  reconfigure-grub-pc-no-option-to-select-boot-device

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