[Bug 1990704] Re: package grub-pc 2.06-2ubuntu12 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

[Acceptable Name]

Oops, forgot to merge stdout and stderr with |&

$ sudo grub-mkconfig |& tail 
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/10_linux_zfs ###
/etc/grub.d/10_linux_zfs: 425: version_find_latest: not found
umount: /tmp/zfsmnt.XMN7oz: target is busy.
rmdir: failed to remove '/tmp/zfsmnt.XMN7oz': Device or resource busy

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https://bugs.launchpad.net/bugs/1990704

Title:
  package grub-pc 2.06-2ubuntu12 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:
  This occurred during a new installation of Kinetic with a daily build
  from 20220920 when doing a ZFS install in qemu.

  ProblemType: PackageDistroRelease: Ubuntu 22.10
  Package: grub-pc 2.06-2ubuntu12
  ProcVersionSignature: Ubuntu 5.19.0-15.15-generic 5.19.0
  Uname: Linux 5.19.0-15-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.23.0-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Fri Sep 23 16:33:27 2022
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  ProcCmdLine: BOOT_IMAGE=/BOOT/ubuntu_qv5znx@/vmlinuz-5.19.0-15-generic root=ZFS=rpool/ROOT/ubuntu_qv5znx ro quiet splash vt.handoff=1
  Python3Details: /usr/bin/python3.10, Python 3.10.7, python3-minimal, 3.10.6-1
  PythonDetails: N/A
  RelatedPackageVersions:
   dpkg 1.21.9ubuntu1
   apt  2.5.2SourcePackage: grub2
  Title: package grub-pc 2.06-2ubuntu12 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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