Thanks for the bug report.
Please reboot with kernel parameter 'nomodeset', or just log into a text
console (Ctrl+Alt+F4) and run:
journalctl -b0 > journal0.txt
journalctl -b-1 > journal-1.txt
journalctl -b-2 > journal-2.txt
journalctl -b-3 > journal-3.txt
lspci -k > lspci.txt
dpkg -l > packages.txt
sudo apt install drm-info
sudo drm_info > drminfo.txt
and then attach the resulting text files here.
** Changed in: gdm3 (Ubuntu)
Status: New => Incomplete
** Package changed: gdm3 (Ubuntu) => ubuntu
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/2121017
Title:
Gdm3 stops
Status in Ubuntu:
Incomplete
Bug description:
My system:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Questing Quokka (development branch)
Release: 25.10
Codename: questing
Completely updated.
After yesterday (2025-08-19) package updates, gdm3 stops on starting
Ubuntu and It's impossible to start Gnome. Gdm3 freezes computer.
On restarting computer, I see a lot of dmesg messages:
nouveau cannot find any crtc or sizes
I've blacklisted nouveau driver and installed several nvidia drivers
and nothing works.
My nvidia is:
# nvidia-driver-assistant
Detected GPUs:
NVIDIA GeForce RTX 4070 Laptop GPU - (pci_id 0x2860)
Detected system:
Ubuntu 25.10
Only works to install lightdm.
ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: gdm3 49~beta-0ubuntu2
ProcVersionSignature: Ubuntu 6.16.0-13.13-generic 6.16.0
Uname: Linux 6.16.0-13-generic x86_64
ApportVersion: 2.33.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 20 08:23:58 2025
InstallationDate: Installed on 2023-06-17 (795 days ago)
InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64
(20220809.1)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
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