[Bug 1864306] Re: package grub-pc 2.04-1ubuntu12.1 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

[Anthony Borrow]

I have two instances running with the same provider (Linode). One
upgraded fine about a month ago. The other has this grub-pc error. The
only differences I noted in the /boot/grub folder was that the one that
is not working has the default and menu.lst files present. Not sure if
it is related but it would appear (anecdotally) that something changed
between my upgrading of the two instances.

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Title:
  package grub-pc 2.04-1ubuntu12.1 failed to install/upgrade: installed
  grub-pc package post-installation script subprocess returned error
  exit status 1

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  automatic update from Ubuntu 19.10 file system zol

  ProblemType: Package
  DistroRelease: Ubuntu 19.10
  Package: grub-pc 2.04-1ubuntu12.1
  ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
  Uname: Linux 5.3.0-23-generic x86_64
  NonfreeKernelModules: nvidia zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8.4
  Architecture: amd64
  Date: Sat Feb 22 17:37:13 2020
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2019-11-16 (97 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  ProcCmdLine: BOOT_IMAGE=/BOOT/ubuntu_tlqbjg@/vmlinuz-5.3.0-23-generic root=ZFS=rpool/ROOT/ubuntu_tlqbjg ro quiet splash vt.handoff=1
  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
  Title: package grub-pc 2.04-1ubuntu12.1 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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