[Bug 1874318] Re: package grub-efi-amd64-signed 1.142+2.04-1ubuntu26 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 10

[James Dingwall]

I manually set the grub-efi/install_devices with the following command
where G1 and G2 were set to my two ESP devices.

echo grub-efi-amd64 grub-efi/install_devices multiselect $G1 $G2 |
debconf-set-selections

With a `set -x` added in /usr/lib/grub/grub-multi-install it now
complains about another unset value:

+ RET='10 grub-efi/partition_description doesn'\''t exist'
+ case ${_db_internal_line%%[   ]*} in
+ return 10

I guess either these variables have been wiped or were never set.  Based
on #3 I did this which resulted in a log of new debconf variables being
set:

grub-efi-amd64 grub-efi/install_devices multiselect

Afterwards `apt-get -f install` completed the setup of grub-efi-
amd64-signed

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https://bugs.launchpad.net/bugs/1874318

Title:
  package grub-efi-amd64-signed 1.142+2.04-1ubuntu26 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 10

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  ?

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: grub-efi-amd64-signed 1.142+2.04-1ubuntu26
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Apr 22 17:09:37 2020
  DuplicateSignature:
   package:grub-efi-amd64-signed:1.142+2.04-1ubuntu26
   Setting up grub-efi-amd64-signed (1.142+2.04-1ubuntu26) ...
   dpkg: error processing package grub-efi-amd64-signed (--configure):
    installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 10
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 10
  InstallationDate: Installed on 2015-07-26 (1732 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.2
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.142+2.04-1ubuntu26 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 10
  UpgradeStatus: Upgraded to focal on 2020-04-22 (0 days ago)

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