Public bug reported:
Package: linux-image-7.0.0-7-generic (Version 7.0.0-7.7) / dracut
Severity: Critical (System unbootable)
Description:
During a routine upgrade on Ubuntu 26.04 "Resolute Raccoon", the installation
of kernel 7.0.0-7-generic fails to generate a valid initramfs using dracut. The
process terminates with an error indicating that the ZFS module cannot be
found, despite the system running on a ZFS root pool.
As a result, the generated /boot/initrd.img-7.0.0-7-generic is
incomplete and lacks the necessary drivers to mount the root filesystem,
leading to a boot failure (Kernel Panic / Initramfs prompt).
Steps to reproduce:
Use Ubuntu 26.04 (Resolute) installed on a ZFS root partition
(rpool).
Run sudo apt update && sudo apt upgrade.
Observe the post-installation triggers for linux-
image-7.0.0-7-generic
Actual results:
/etc/kernel/postinst.d/dracut:
dracut: Generating /boot/initrd.img-7.0.0-7-generic
dracut-install: Failed to find module 'zfs'
dracut[E]: FAILED: /usr/lib/dracut/dracut-install -D
/var/tmp/dracut.XXXXXX/initramfs --kerneldir /usr/lib/modules/7.0.0-7-generic
-m zfs
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-7-generic 7.0.0-7.7
ProcVersionSignature: Ubuntu 6.19.0-9.9-generic 6.19.5
Uname: Linux 6.19.0-9-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: Unity
Date: Wed Mar 18 12:30:26 2026
InstallationDate: Installed on 2026-03-13 (5 days ago)
InstallationMedia: Ubuntu 26.04 LTS "Resolute Raccoon" - Daily amd64 (20260313)
MachineType: ASUS System Product Name
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 nvidia-drmdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu_o2oj4n@/vmlinuz-6.19.0-9-generic
root=ZFS=rpool/ROOT/ubuntu_o2oj4n ro no_console_suspend initcall_debug
ignore_loglevel
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/25/2025
dmi.bios.release: 30.1
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3001
dmi.board.asset.tag: Default string
dmi.board.name: ROG MAXIMUS Z790 HERO
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr3001:bd04/25/2025:br30.1:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGMAXIMUSZ790HERO:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: ASUS
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2144745
Title:
linux-image-7.0.0-7-generic: dracut fails to include zfs module on
ZFS-on-root system (Ubuntu 26.04 Resolute)
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