[Bug 1741046] Re: package grub-pc 2.02~beta2-36ubuntu3.15 failed to install/upgrade: subprocess installed post-installation script returned error exit status 20

[adrya]

Received the same error when upgrading from Linux Mint 18.2 to 18.3.

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Title:
  package grub-pc 2.02~beta2-36ubuntu3.15 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 20

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  failed to install

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: grub-pc 2.02~beta2-36ubuntu3.15
  ProcVersionSignature: Ubuntu 4.4.0-104.127-generic 4.4.98
  Uname: Linux 4.4.0-104-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.14
  Architecture: amd64
  Date: Wed Jan  3 18:16:16 2018
  DuplicateSignature:
   package:grub-pc:2.02~beta2-36ubuntu3.15
   Setting up grub-pc (2.02~beta2-36ubuntu3.15) ...
   dpkg: error processing package grub-pc (--configure):
    subprocess installed post-installation script returned error exit status 20
  ErrorMessage: subprocess installed post-installation script returned error exit status 20
  InstallationDate: Installed on 2016-11-07 (422 days ago)
  InstallationMedia:
   
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-104-generic.efi.signed root=UUID=8ec31e72-2cd5-4a2e-8764-fdbe02245114 ro i8042.reset
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.3
   apt  1.2.24
  SourcePackage: grub2
  Title: package grub-pc 2.02~beta2-36ubuntu3.15 failed to install/upgrade: subprocess installed post-installation script returned error exit status 20
  UpgradeStatus: No upgrade log present (probably fresh install)

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