package grub-pc 2.06-2ubuntu12.1 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1 (This happened on a minimal install (default zfs) on a synology vm manager instance.

This happened on a ubuntu 22.10 desktop, minimal install with default zfs fs setup.

ProblemType: Package
DistroRelease: Ubuntu 22.10
Package: grub-pc 2.06-2ubuntu12.1
ProcVersionSignature: Ubuntu 5.19.0-21.21-generic 5.19.7
Uname: Linux 5.19.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.23.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Sun Mar 12 17:12:31 2023
ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
ProcCmdLine: BOOT_IMAGE=/BOOT/ubuntu_0nb62u@/vmlinuz-5.19.0-21-generic root=ZFS=rpool/ROOT/ubuntu_0nb62u 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 2.5.3
SourcePackage: grub2
Title: package grub-pc 2.06-2ubuntu12.1 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)