[Bug 1913329] Re: package grub-efi-amd64-signed 1.142.10+2.04-1ubuntu26.8 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 32

[M.J. van 't Hull]

In the past I have copied the system disk to another SSD. Including the GRUB setup.
This is probably why the upgrade identified to occurences of grub on the system.
IT asked me to choose one of the occurrences. When I did It came back with a warning asking me to continue without installing grub. 
I understood this warnin as not  installing the grub update at all. to which I replied no.
It returned me back to choice which grub occurrence to upgrade. So I selected both which resulted in this error.

Should the grub upgrade not check which occurence has last been used to
start the system, and automatically select that occurence to upgrade?

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Title:
  package grub-efi-amd64-signed 1.142.10+2.04-1ubuntu26.8 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 32

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  Just doing a release upgrade...

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: grub-efi-amd64-signed 1.142.10+2.04-1ubuntu26.8
  ProcVersionSignature: Ubuntu 4.15.0-134.138-generic 4.15.18
  Uname: Linux 4.15.0-134-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Tue Jan 26 18:03:57 2021
  DuplicateSignature:
   package:grub-efi-amd64-signed:1.142.10+2.04-1ubuntu26.8
   Setting up grub-efi-amd64-signed (1.142.10+2.04-1ubuntu26.8) ...
   mount: /var/lib/grub/esp: special device /dev/disk/by-id/scsi-360022480e7ba34d2096c34a1a011e48d-part1 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
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 32
  InstallationDate: Installed on 2020-05-12 (258 days ago)
  InstallationMedia: Ubuntu-Server 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.4
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.142.10+2.04-1ubuntu26.8 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 32
  UpgradeStatus: Upgraded to focal on 2021-01-26 (0 days ago)

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