[Bug 2133418] [NEW] Failed to setup: No GPUs found

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Hello

There are no operational issues with version 24.04.

The problem occurs when attempting to install version 26.04.

The installer gets stuck in a loop when opening the installer's
graphical session, despite the presence of the NOMODESET option.

Here are some collected logs.

root@b:/media/a/writable/install-logs-2025-11-29.0/log# head dmesg
[ 37.249870] kernel: Linux version 6.17.0-5-generic (buildd@lcy02-amd64-035) (x86_64-linux-gnu-gcc (Ubuntu 15.2.0-4ubuntu2) 15.2.0, GNU ld (GNU Binutils for Ubuntu) 2.45) #5-Ubuntu SMP PREEMPT_DYNAMIC Mon Sep 22 10:00:33 UTC 2025 (Ubuntu 6.17.0-5.5-generic 6.17.0-rc7)
[ 37.249989] kernel: Command line: BOOT_IMAGE=/casper/vmlinuz nomodeset --- quiet splash
[ 37.251135] kernel: KERNEL supported cpus:
[ 37.251194] kernel: Intel GenuineIntel
[ 37.251237] kernel: AMD AuthenticAMD
[ 37.251280] kernel: Hygon HygonGenuine
[ 37.251353] kernel: Centaur CentaurHauls
[ 37.251398] kernel: zhaoxin Shanghai
[ 37.251443] kernel: BIOS-provided physical RAM map:
[ 37.251489] kernel: BIOS-e820: [mem 0x0000000000000000-0x00000000000977ff] usable


root@b:/media/a/writable/install-logs-2025-11-29.0/log# grep "Started session-c" syslog
2025-11-29T11:03:14.270747+00:00 ubuntu systemd[1]: Started session-c1.scope - Session c1 of User gdm-greeter.
2025-11-29T11:03:59.938616+00:00 ubuntu systemd[1]: Started session-c2.scope - Session c2 of User gdm-greeter.
2025-11-29T11:04:37.406300+00:00 ubuntu systemd[1]: Started session-c3.scope - Session c3 of User gdm-greeter.
2025-11-29T11:05:28.698318+00:00 ubuntu systemd[1]: Started session-c4.scope - Session c4 of User gdm-greeter.
2025-11-29T11:05:54.570332+00:00 ubuntu systemd[1]: Started session-c5.scope - Session c5 of User gdm-greeter.
2025-11-29T11:08:30.805128+00:00 ubuntu systemd[1]: Started session-c6.scope - Session c6 of User gdm-greeter.
2025-11-29T11:13:17.794394+00:00 ubuntu systemd[1]: Started session-c7.scope - Session c7 of User gdm-greeter.


EXTRACT of syslog
2025-11-29T11:16:08.263371+00:00 ubuntu systemd[17377]: Started gnome-session-manager@ubuntu.service - GNOME Session Manager (session: ubuntu).
2025-11-29T11:16:08.265155+00:00 ubuntu systemd[17377]: Reached target gnome-session-manager.target - GNOME Session Manager is ready.
2025-11-29T11:16:08.267212+00:00 ubuntu snapd-desktop-i[42206]: Loop exited. Forcing reload.
2025-11-29T11:16:08.271902+00:00 ubuntu systemd[17377]: Starting org.gnome.Shell@wayland.service - GNOME Shell on Wayland...
2025-11-29T11:16:08.292021+00:00 ubuntu systemd[17377]: snap.snapd-desktop-integration.snapd-desktop-integration.service: Consumed 1.841s CPU time, 15.8M memory peak.
2025-11-29T11:16:09.314062+00:00 ubuntu gnome-shell[42217]: Running GNOME Shell (using mutter 49.0) as a Wayland display server
2025-11-29T11:16:09.336295+00:00 ubuntu gnome-shell[42217]: Enabling experimental feature 'scale-monitor-framebuffer'
2025-11-29T11:16:09.336785+00:00 ubuntu gnome-shell[42217]: Enabling experimental feature 'xwayland-native-scaling'
2025-11-29T11:16:10.163309+00:00 ubuntu rtkit-daemon[2682]: Supervising 2 threads of 1 processes of 1 users.
2025-11-29T11:16:10.178189+00:00 ubuntu rtkit-daemon[2682]: Successfully made thread 42229 of process 42217 owned by '1000' high priority at nice level -15.
2025-11-29T11:16:10.178483+00:00 ubuntu rtkit-daemon[2682]: Supervising 3 threads of 2 processes of 1 users.
2025-11-29T11:16:10.179091+00:00 ubuntu gnome-shell[42217]: Thread 'KMS thread' will be using high priority scheduling
2025-11-29T11:16:10.190180+00:00 ubuntu gnome-shell[42217]: Failed to setup: No GPUs found
2025-11-29T11:16:10.263431+00:00 ubuntu systemd[17377]: org.gnome.Shell@wayland.service: Failed with result 'protocol'.
2025-11-29T11:16:10.265365+00:00 ubuntu systemd[17377]: Failed to start org.gnome.Shell@wayland.service - GNOME Shell on Wayland.
2025-11-29T11:16:10.265613+00:00 ubuntu systemd[17377]: org.gnome.Shell@wayland.service: Consumed 1.883s CPU time, 27.1M memory peak.
2025-11-29T11:16:10.265806+00:00 ubuntu systemd[17377]: org.gnome.Shell@wayland.service: Triggering OnFailure= dependencies.
2025-11-29T11:16:10.267714+00:00 ubuntu systemd[17377]: Stopping gvfs-daemon.service - Virtual filesystem service...
....... and all the stopping.....


For information, in 24.04

a@b:~$ echo $XDG_SESSION_TYPE
wayland
a@b:~$ journalctl --no-pager -b -p notice | grep GPU
nov. 29 12:19:26 b gnome-shell[2077]: Failed to initialize accelerated iGPU/dGPU framebuffer sharing: KMS CRTC doesn't support GBM format
nov. 29 12:19:26 b gnome-shell[2077]: Boot VGA GPU /dev/dri/card0 selected as primary
nov. 29 12:19:55 b gnome-shell[2941]: Failed to initialize accelerated iGPU/dGPU framebuffer sharing: KMS CRTC doesn't support GBM format
nov. 29 12:19:55 b gnome-shell[2941]: Boot VGA GPU /dev/dri/card0 selected as primary
a@b:~$


There's probably an option to add to GRUB to inform the software of the absence of a graphics card, but I haven't found it.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: gdm3 46.2-1ubuntu1~24.04.4
ProcVersionSignature: Ubuntu 6.8.0-88.89-generic 6.8.12
Uname: Linux 6.8.0-88-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Nov 29 13:43:46 2025
InstallationDate: Installed on 2024-09-18 (437 days ago)
InstallationMedia: Ubuntu 22.04.4 LTS "Jammy Jellyfish" - Release amd64 (20240220)
ProcEnviron:
LANG=fr_FR.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: gdm3
UpgradeStatus: Upgraded to noble on 2024-09-18 (437 days ago)

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


** Tags: amd64 apport-bug noble wayland-session
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Failed to setup: No GPUs found
https://bugs.launchpad.net/bugs/2133418
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