Home / ubuntu / Questions / 1414934
Accepted
Baa
Asked: 2022-06-21 08:10:24 +0800 CST

GDM unable to start on RaspberryPi 4 with Ubuntu Server 22.04

  • 772

I am trying to use Ubuntu Server 22.04 on a Raspberry Pi 4. I have installed the packages ubuntu-desktop-minimal and rebooted but I get no login screen on the Pi only a blinking dash.

I have also tried the ubuntu-desktop-raspi and ubuntu-desktop packages to no avail.

I have also tried editing /etc/gdm3/custom.conf and uncommenting WaylandEnable=false to try without Wayland but the result was the same.

During boot the screen appears to work ok I get the boot logs appearing on my monitor etc.

GDM seems to be running but showing this in the log:

Jun 20 16:58:18 SYKIOSKPI gdm-launch-environment][1232]: pam_unix(gdm-launch-environment:session): session closed for user gdm
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1232]: pam_unix(gdm-launch-environment:session): session opened for user gdm(uid=116) by (uid=0)
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: Child process -1227 was already dead.
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: Child process -1227 was already dead.
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1221]: GLib-GObject: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1221]: pam_unix(gdm-launch-environment:session): session closed for user gdm
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1221]: pam_unix(gdm-launch-environment:session): session opened for user gdm(uid=116) by (uid=0)
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: Child process -1217 was already dead.
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: Child process -1217 was already dead.
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1211]: GLib-GObject: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1211]: pam_unix(gdm-launch-environment:session): session closed for user gdm
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1211]: pam_unix(gdm-launch-environment:session): session opened for user gdm(uid=116) by (uid=0)
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: Child process -1207 was already dead.
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: Child process -1207 was already dead.
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1200]: GLib-GObject: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1200]: pam_unix(gdm-launch-environment:session): session closed for user gdm
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1200]: pam_unix(gdm-launch-environment:session): session opened for user gdm(uid=116) by (uid=0)
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: Child process -1187 was already dead.
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: Child process -1187 was already dead.
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1177]: GLib-GObject: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jun 20 16:58:17 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:58:17 SYKIOSKPI gdm-launch-environment][1177]: pam_unix(gdm-launch-environment:session): session closed for user gdm
Jun 20 16:58:16 SYKIOSKPI gdm-launch-environment][1177]: pam_unix(gdm-launch-environment:session): session opened for user gdm(uid=116) by (uid=0)
Jun 20 16:58:16 SYKIOSKPI gdm3[1086]: Gdm: Child process -1165 was already dead.
Jun 20 16:58:16 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:58:16 SYKIOSKPI gdm3[1086]: Gdm: Child process -1165 was already dead.
Jun 20 16:58:16 SYKIOSKPI gdm3[1086]: Gdm: GdmDisplay: Session never registered, failing
Jun 20 16:57:43 SYKIOSKPI gdm-launch-environment][1149]: pam_unix(gdm-launch-environment:session): session opened for user gdm(uid=116) by (uid=0)
Jun 20 16:57:33 SYKIOSKPI systemd[1]: Started GNOME Display Manager.
Jun 20 16:57:33 SYKIOSKPI systemd[1]: Starting GNOME Display Manager...

I've enabled debug in GDM and ran it again, log can be found here: https://pastebin.com/ze8PWHEd

This is the GDM X server log: https://pastebin.com/c4uTZRVn

Unsure what to try next

22.04

1 Answers

  1. Best Answer

    As per this answer I added dtoverlay=vc4-fkms-v3d into /boot/firmware/config.txt and it now works.

    I would accept any answer that can explain what this means and if there's a better alternative, this setting works but I do not know what it does.

    • 0