Public bug reported:
Summary
After applying updates to Ubuntu 24.04.3 and installing LXD, a corporate
ThinkPad T14 entered a bootloop state. Immediately following successful
LUKS decryption, the system would crash and kick the user (me) back to
the GRUB menu. The issue persisted across multiple kernel versions
(6.14.0-1019-oem, 6.14.0-1018-oem, and 6.14.0-37-generic).
The system eventually recovered after booting into Recovery Mode and
then performing a standard reboot, during the course of a discussion
with the Canonical Support Team on Mattermost. Post-recovery, the system
is stable on the latest OEM kernel, and previously reported hardware
issues (Bluetooth initialization) appear to have also resolved.
Environment
Machine: Lenovo ThinkPad T14 (21QJCTO1WW)
OS: Ubuntu 24.04.3 LTS
Kernel (at time of failure): 6.14.0-1019-oem
Authentication: authd (Canonical corporate environment)
Disk Layout: LVM on LUKS
Steps to reproduce
The issue is currently non-deterministic as it was resolved by a
recovery boot, but the state leading to it was:
1. Apply standard updates to 24.04.3.
2. Install LXD.
3. Reboot machine.
4. Enter LUKS passphrase at the splash screen.
Expected Result: Transition to GDM login or user session.
Actual Result: System resets immediately after decryption, returning to GRUB.
Logs & Technical Observations
Logs from the failing state (journalctl -b) show significant noise
around GDM and the GPU stack:
- GDM Assertions: gdm3[2147]: Gdm: on_display_added: assertion
'GDM_IS_REMOTE_DISPLAY (display)' failed gdm3[2147]: GLib-GIO:
g_dbus_proxy_call_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
- Chrome GPU Meltdown: google-chrome.desktop[3973]:
[4335:4335:0128/104301.275989:ERROR:gpu/command_buffer/service/context_group.cc:130]
ContextResult::kFatalFailure: WebGL1 blocklisted
- Authentication/Service Failures: friendly-recovery failed with exit status 1
gdm-authd[3347]: gkr-pam: couldn't unlock the login keyring. authd[1201]: rpc
error: code = NotFound desc =
Full logs available upon request due to the visibility of personal
information / corporate metadata.
Current Status
System is currently operational.
$ uname -a
Linux T14 6.14.0-1019-oem #19-Ubuntu SMP PREEMPT_DYNAMIC Thu Dec 18 05:40:21
UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.14.0-1020-oem 6.14.0-1020.20
ProcVersionSignature: Ubuntu 6.14.0-1020.20-oem 6.14.11
Uname: Linux 6.14.0-1020-oem x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Feb 9 13:40:14 2026
InstallationDate: Installed on 2025-11-17 (84 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
MachineType: LENOVO 21QJCTO1WW
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/usr/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.14.0-1020-oem
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.14.0-1020-oem N/A
linux-backports-modules-6.14.0-1020-oem N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.23
SourcePackage: linux-oem-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/07/2025
dmi.bios.release: 1.17
dmi.bios.vendor: LENOVO
dmi.bios.version: R2XET37W (1.17 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21QJCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.9
dmi.modalias:
dmi:bvnLENOVO:bvrR2XET37W(1.17):bd11/07/2025:br1.17:efr1.9:svnLENOVO:pn21QJCTO1WW:pvrThinkPadT14Gen6:rvnLENOVO:rn21QJCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21QJ_BU_Think_FM_ThinkPadT14Gen6:
dmi.product.family: ThinkPad T14 Gen 6
dmi.product.name: 21QJCTO1WW
dmi.product.sku: LENOVO_MT_21QJ_BU_Think_FM_ThinkPad T14 Gen 6
dmi.product.version: ThinkPad T14 Gen 6
dmi.sys.vendor: LENOVO
** Affects: linux-oem-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug kernel-oem noble oem-priority t14 wayland-session
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https://bugs.launchpad.net/bugs/2141321
Title:
[T14] System reset to GRUB immediately after LUKS decryption on
6.14.0-1019-oem
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