[Bug 1860491] Re: package grub-efi-amd64-signed 1.128.1+2.04-1ubuntu12.1 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 127

[Tomdkat]

I experienced this upgrading from Ubuntu 18.04.5 to 20.04.1

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Title:
  package grub-efi-amd64-signed 1.128.1+2.04-1ubuntu12.1 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 127

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  etting up grub-efi-amd64-signed (1.128.1+2.04-1ubuntu12.1) ...
  od: /sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c: read error: Interrupted system call
  /usr/share/grub/grub-check-signatures: 22: [: Illegal number: 
  dpkg: error processing package grub-efi-amd64-signed (--configure):
   installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 127
  Errors were encountered while processing:
   grub-efi-amd64-signed
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  ProblemType: Package
  DistroRelease: Ubuntu 19.10
  Package: grub-efi-amd64-signed 1.128.1+2.04-1ubuntu12.1
  ProcVersionSignature: Ubuntu 5.3.0-26.28-generic 5.3.13
  Uname: Linux 5.3.0-26-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.2
  AptOrdering: NULL: ConfigurePending
  Architecture: amd64
  Date: Tue Jan 21 23:51:55 2020
  DpkgTerminalLog:
   Setting up grub-efi-amd64-signed (1.128.1+2.04-1ubuntu12.1) ...
   od: /sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c: read error: Interrupted system call
   /usr/share/grub/grub-check-signatures: 22: [: Illegal number: 
   dpkg: error processing package grub-efi-amd64-signed (--configure):
    installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 127
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 127
  InstallationDate: Installed on 2019-03-27 (300 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190318)
  Python3Details: /usr/bin/python3.7, Python 3.7.5, python3-minimal, 3.7.5-1
  PythonDetails: N/A
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu2
   apt  1.9.4
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.128.1+2.04-1ubuntu12.1 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 127
  UpgradeStatus: Upgraded to eoan on 2020-01-11 (10 days ago)

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