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

[Brian Murray]

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)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
https://iso.qa.ubuntu.com/qatracker/reports/bugs/1990704

[Brian Murray (brian-murray)]

This probably happened 'CasperMD5CheckResult: unknown' because /var/log/installer/ is empty.

[Benjamin Drung (bdrung)]

DpkgTerminalLog.txt:

Setting up grub-pc (2.06-2ubuntu12) ...
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
find: ‘mount: (hint) your fstab has been modified, but systemd still uses\n the old version; use 'systemctl daemon-reload' to reload.\n/tmp/zfsmnt.BfV5Td/boot’: No such file or directory
umount: /tmp/zfsmnt.BfV5Td: target is busy.
rmdir: failed to remove '/tmp/zfsmnt.BfV5Td': Device or resource busy
dpkg: error processing package grub-pc (--configure):
 installed grub-pc package post-installation script subprocess returned error exit status 1

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Knickers Brown (metta-crawler)]

$ sudo grub-mkconfig | tail
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
/etc/grub.d/10_linux_zfs: 425: version_find_latest: not found
umount: /tmp/zfsmnt.YABeWP: target is busy.
rmdir: failed to remove '/tmp/zfsmnt.YABeWP': Device or resource busy

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
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 ###

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Mantic Minotaur (development branch)
Release: 23.10
Codename: mantic

$ dpkg -l | grep -Ev '^ii|^rc|^ic'
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-=============================================-=======================================-============-================================================================================
iU grub-efi-amd64-signed 1.194+2.12~rc1-4ubuntu1 amd64 GRand Unified Bootloader, version 2 (EFI-AMD64 version, signed)
iF grub-pc 2.12~rc1-4ubuntu1 amd64 GRand Unified Bootloader, version 2 (PC/BIOS version)
iF linux-image-6.3.0-7-generic 6.3.0-7.7+1 amd64 Signed kernel image generic

[Knickers Brown (metta-crawler)]

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

[Knickers Brown (metta-crawler)]

#2031042