[Bug 1871963] Re: dpkg fails to install grub-efi-amd64 signed and shim-signed

[Alex Haydock]

We're seeing this one too, on Ubuntu 20.04. I think something
interesting to note is the disk layout which might be causing it to
happen.

During apt upgrade or forced grub package installation, I get:

    mount: /var/lib/grub/esp: special device /dev/sda1 does not exist.
    dpkg: error processing package grub-efi-amd64-signed (--configure):
     installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 32

It seems like the install script is looking for /dev/sda1 to install
GRUB updates to.

When checking /etc/fstab, I can see a line which states:

    # /boot/efi was on /dev/sda1 during curtin installation

It's a VMware VM which was installed to a single emulated SCSI root
VMDK, which will have been /dev/sda during installation. But /dev/sda1
no longer exists because new disks have been added to this system since
then.

It seems like when assigning letters (as per the /dev/sd* schema), the
SAS disks get assigned letters first, followed by the SCSI boot drive,
which ends up being /dev/sdq (meaning the partition GRUB originally
installed to is now all the way down at /dev/sdq1).

The disk that ends up being allocated to /dev/sda is one of many in a
RAID array, and these are encrypted using LUKS across the entire disk
(no partition). So there is no /dev/sda1 at all anymore as far as the
GRUB installer is concerned.

Is there any way I can force GRUB to find the correct /boot/efi
location? (Running lsblk confirms it is definitely at /dev/sdq1 now).

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https://bugs.launchpad.net/bugs/1871963

Title:
  dpkg fails to install grub-efi-amd64 signed and shim-signed

Status in dpkg package in Ubuntu:
  Invalid
Status in grub2-signed package in Ubuntu:
  Fix Released

Bug description:
  See above

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: dpkg 1.19.7ubuntu3
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Thu Apr  9 18:41:33 2020
  InstallationDate: Installed on 2020-04-09 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: dpkg
  UpgradeStatus: No upgrade log present (probably fresh install)

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