Public bug reported:
This bug has been seen on two different machines (One AMD and one Intel
N100) running Ubuntu Cinnamon 24.04 and also 26.04. When rebooting the
machine, the machine will hang on boot and newer show the login screen.
Sometimes I could press escape to show the boot log. Then it showed
following errors:
set_capacity_and_notify: 16 callbacks suppressed
kauditd_printk_skb: 182 callbacks suppressed
[FAILED] Failed to start lightdm.service
This failure happens with initramfs-tools and dracut.
I found following workarounds:
* boot without "spash"
* build the dracut initrd with drm instead of simpledrm
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: lightdm 1.32.0-6ubuntu4
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: X-Cinnamon
Date: Sun Oct 18 22:46:52 2026
InstallationDate: Installed on 2025-02-25 (600 days ago)
InstallationMedia: Ubuntu-Cinnamon 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827)
ProcEnviron:
LANG=de_DE.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: lightdm
UpgradeStatus: Upgraded to resolute on 2026-10-18 (0 days ago)
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2171364
Title:
Ubuntu Cinnamon: lightdm fails to start after rebooting the machine
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