Public bug reported:
LUKS root volume fails to unlock with kernel 7.0.0-28-generic,
but works with 7.0.0-27-generic.
After upgrading from 7.0.0-27.27 to 7.0.0-28.28, the Plymouth
LUKS prompt rejects the correct passphrase with:
cryptsetup: ERROR: dm_crypt-0: cryptsetup failed, bad password or
options?
The same passphrase and the same LUKS2 volume work correctly when
booting 7.0.0-27-generic and when opening the volume from an Ubuntu
Live system using cryptsetup.
I recreated the initramfs for 7.0.0-28-generic:
sudo update-initramfs -c -k 7.0.0-28-generic
sudo update-grub
Both commands completed without errors, but the issue persists.
Affected kernel:
7.0.0-28-generic
Working kernel:
7.0.0-27-generic
LUKS device:
/dev/nvme0n1p3
LUKS version:
LUKS2
The crypttab UUID matches the actual LUKS UUID.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-27-generic 7.0.0-27.27
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: gpad 4459 F.... wireplumber
/dev/snd/controlC1: gpad 4459 F.... wireplumber
/dev/snd/controlC0: gpad 4459 F.... wireplumber
/dev/snd/seq: gpad 4436 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Jul 18 12:01:56 2026
InstallationDate: Installed on 2025-08-20 (332 days ago)
InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3)
MachineType: SANTECH PCX0DX
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB:
0 i915drmfb
1 nvidia-drmdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-27-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-06-04 (44 days ago)
dmi.bios.date: 05/20/2020
dmi.bios.release: 7.3
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 1.07.03TSAS
dmi.board.asset.tag: Tag 12345
dmi.board.name: PCX0DX
dmi.board.vendor: SANTECH
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: SANTECH
dmi.chassis.version: N/A
dmi.ec.firmware.release: 7.2
dmi.modalias:
dmi:bvnINSYDECorp.:bvr1.07.03TSAS:bd05/20/2020:br7.3:efr7.2:svnSANTECH:pnPCX0DX:pvrNotApplicable:rvnSANTECH:rnPCX0DX:rvrNotApplicable:cvnSANTECH:ct10:cvrN/A:skuNotApplicable:pfaNotApplicable:
dmi.product.family: Not Applicable
dmi.product.name: PCX0DX
dmi.product.sku: Not Applicable
dmi.product.version: Not Applicable
dmi.sys.vendor: SANTECH
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2161181
Title:
[Regression] LUKS root passphrase rejected on kernel 7.0.0-28, works
on 7.0.0-27
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