Public bug reported:

mozlet@595X570-68xTaichi:~/tmp$ sudo apt install dkms zfs-dkms
Installing:                     
  dkms  zfs-dkms

Suggested packages:
  debhelper

Recommended packages:
  linux-libc-dev

Summary:
  Upgrading: 0, Installing: 2, Removing: 0, Not Upgrading: 20
  2 not fully installed or removed.
  Download size: 2,585 kB
  Space needed: 19.1 MB / 1,890 GB available

Get:1 https://la.mirrors.clouvider.net/ubuntu questing/main amd64 dkms all 
3.2.0-1ubuntu1 [62.4 kB]
Get:2 https://la.mirrors.clouvider.net/ubuntu questing/universe amd64 zfs-dkms 
all 2.3.4-1ubuntu2 [2,522 kB]
Fetched 2,585 kB in 4s (702 kB/s)     
Preconfiguring packages ...
Selecting previously unselected package dkms.
(Reading database ... 204022 files and directories currently installed.)
Preparing to unpack .../dkms_3.2.0-1ubuntu1_all.deb ...
Unpacking dkms (3.2.0-1ubuntu1) ...
Selecting previously unselected package zfs-dkms.
Preparing to unpack .../zfs-dkms_2.3.4-1ubuntu2_all.deb ...
Unpacking zfs-dkms (2.3.4-1ubuntu2) ...
Setting up dkms (3.2.0-1ubuntu1) ...
Created symlink '/etc/systemd/system/multi-user.target.wants/dkms.service' → 
'/usr/lib/systemd/system/dkms.service'.
Setting up zfs-dkms (2.3.4-1ubuntu2) ...
Loading new zfs/2.3.4 DKMS files...
Building for 6.17.0-12-generic and 6.18.8-x64v3-xanmod1

Building initial module zfs/2.3.4 for 6.17.0-12-generic
Sign command: /usr/bin/kmodsign
Certificate or key are missing, generating them using 
update-secureboot-policy...
Adding '/var/lib/shim-signed/mok/MOK.der' to shim:
Signing key: /var/lib/shim-signed/mok/MOK.priv
Public certificate (MOK): /var/lib/shim-signed/mok/MOK.der

Running the pre_build script........... done.
Building module(s)........ done.
Signing module /var/lib/dkms/zfs/2.3.4/build/module/zfs.ko
Signing module /var/lib/dkms/zfs/2.3.4/build/module/spl.ko
Running the post_build script... done.
Module /lib/modules/6.17.0-12-generic/kernel/zfs/zfs.ko.zst already installed 
at version 2.3.4-1ubuntu2, override by specifying --force
Module /lib/modules/6.17.0-12-generic/kernel/zfs/spl.ko.zst already installed 
at version 2.3.4-1ubuntu2, override by specifying --force
Running depmod... done.

Building initial module zfs/2.3.4 for 6.18.8-x64v3-xanmod1
Sign command: /usr/bin/kmodsign
Signing key: /var/lib/shim-signed/mok/MOK.priv
Public certificate (MOK): /var/lib/shim-signed/mok/MOK.der

Running the pre_build script....(bad exit status: 1)
Failed command:
cd /var/lib/dkms/zfs/2.3.4/build/ && /var/lib/dkms/zfs/2.3.4/build/configure 
--disable-dependency-tracking --prefix=/usr --with-config=kernel 
--with-linux=/lib/modules/6.18.8-x64v3-xanmod1/build 
--with-linux-obj=/lib/modules/6.18.8-x64v3-xanmod1/build --with-qat= --host= 
--enable-linux-experimental 
Consult /var/lib/dkms/zfs/2.3.4/build/make.log for more information.
dpkg: error processing package zfs-dkms (--configure):
 installed zfs-dkms package post-installation script subprocess returned error 
exit status 1
Setting up linux-image-6.18.8-x64v3-xanmod1 
(6.18.8-x64v3-xanmod1-0~20260130.g72a26c9) ...
Sign command: /usr/bin/kmodsign
Signing key: /var/lib/shim-signed/mok/MOK.priv
Public certificate (MOK): /var/lib/shim-signed/mok/MOK.der

Autoinstall of module zfs/2.3.4 for kernel 6.18.8-x64v3-xanmod1 (x86_64)
Running the pre_build script....(bad exit status: 1)
Failed command:
cd /var/lib/dkms/zfs/2.3.4/build/ && /var/lib/dkms/zfs/2.3.4/build/configure 
--disable-dependency-tracking --prefix=/usr --with-config=kernel 
--with-linux=/lib/modules/6.18.8-x64v3-xanmod1/build 
--with-linux-obj=/lib/modules/6.18.8-x64v3-xanmod1/build --with-qat= --host= 
--enable-linux-experimental 
Consult /var/lib/dkms/zfs/2.3.4/build/make.log for more information.

Autoinstall on 6.18.8-x64v3-xanmod1 failed for module(s) zfs(1).

Error! One or more modules failed to install during autoinstall.
Refer to previous errors for more information.
run-parts: /etc/kernel/postinst.d/dkms exited with return code 1
dracut: Generating /boot/initrd.img-6.18.8-x64v3-xanmod1
dracut-install: Failed to find module 'zfs'
dracut[E]: FAILED:  /usr/lib/dracut/dracut-install -D 
/var/tmp/dracut.dDtO9Xb/initramfs -H --kerneldir 
/usr/lib/modules/6.18.8-x64v3-xanmod1 -m zfs
dracut[F]: installkernel failed in module zfs
run-parts: /etc/kernel/postinst.d/dracut exited with return code 1
kdump-tools: Generating /var/lib/kdump/initrd.img-6.18.8-x64v3-xanmod1
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/kdump-tools.cfg'
Generating grub configuration file ...
Found linux image: vmlinuz-6.18.8-x64v3-xanmod1 in rpool/ROOT/ubuntu_60wm3z
Warning: Couldn't find any valid initrd for dataset rpool/ROOT/ubuntu_60wm3z.
Found linux image: vmlinuz-6.17.0-12-generic in rpool/ROOT/ubuntu_60wm3z
Found initrd image: initrd.img-6.17.0-12-generic in rpool/ROOT/ubuntu_60wm3z
Found linux image: vmlinuz-6.18.8-x64v3-xanmod1 in 
rpool/ROOT/ubuntu_60wm3z@thanks_grok_20260202_001530
Warning: Couldn't find any valid initrd for dataset 
rpool/ROOT/ubuntu_60wm3z@thanks_grok_20260202_001530.
Found linux image: vmlinuz-6.17.0-12-generic in 
rpool/ROOT/ubuntu_60wm3z@thanks_grok_20260202_001530
Found initrd image: initrd.img-6.17.0-12-generic in 
rpool/ROOT/ubuntu_60wm3z@thanks_grok_20260202_001530
Found memtest86+ 64bit EFI image: /boot/memtest86+x64.efi
Found memtest86+ 32bit EFI image: /boot/memtest86+ia32.efi
Found memtest86+ 64bit image: /boot/memtest86+x64.bin
Found memtest86+ 32bit image: /boot/memtest86+ia32.bin
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
done
dpkg: error processing package linux-image-6.18.8-x64v3-xanmod1 (--configure):
 installed linux-image-6.18.8-x64v3-xanmod1 package post-installation script 
subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of linux-xanmod-x64v3:
 linux-xanmod-x64v3 depends on linux-image-6.18.8-x64v3-xanmod1; however:
  Package linux-image-6.18.8-x64v3-xanmod1 is not configured yet.

dpkg: error processing package linux-xanmod-x64v3 (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup 
error from a previous failure.
                                                                                
                          Processing triggers for dracut (108-3ubuntu3) ...
update-initramfs: Generating /boot/initrd.img-6.17.0-12-generic
Processing triggers for man-db (2.13.1-1) ...
Errors were encountered while processing:
 zfs-dkms
 linux-image-6.18.8-x64v3-xanmod1
 linux-xanmod-x64v3
needrestart is being skipped since dpkg has failed
Error: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 25.10
Package: zfs-dkms 2.3.4-1ubuntu2
ProcVersionSignature: Ubuntu 6.17.0-12.12-generic 6.17.2
Uname: Linux 6.17.0-12-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.33.1-0ubuntu3
AptOrdering:
 dkms:amd64: Install
 zfs-dkms:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
CasperMD5CheckResult: pass
Date: Wed Feb  4 19:52:10 2026
ErrorMessage: installed zfs-dkms package post-installation script subprocess 
returned error exit status 1
InstallationDate: Installed on 2026-01-31 (5 days ago)
InstallationMedia: Ubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
PackageArchitecture: all
Python3Details: /usr/bin/python3.13, Python 3.13.7, python3-minimal, 3.13.7-1
PythonDetails: N/A
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions:
 dpkg 1.22.21ubuntu3.1
 apt  3.1.6ubuntu2
SourcePackage: zfs-linux
Title: package zfs-dkms 2.3.4-1ubuntu2 failed to install/upgrade: installed 
zfs-dkms package post-installation script subprocess returned error exit status 
1
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: zfs-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package questing

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https://bugs.launchpad.net/bugs/2140517

Title:
  package zfs-dkms 2.3.4-1ubuntu2 failed to install/upgrade: installed
  zfs-dkms package post-installation script subprocess returned error
  exit status 1

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