Public bug reported:
On both Impish and Jammy, gdm3 does not offer greeter to XDMCP sessions.
Instead, it shows the "Oh no! Something has gone wrong" image on the
root window. This indicates that the XDMCP part is working, but the
session is not.
Expected: remote sessions should work out of the box.
$ lsb_release -rd
Description: Ubuntu Jammy Jellyfish (development branch)
Release: 22.04
$ apt policy gdm3
gdm3:
Installed: 41.0-3ubuntu2
Candidate: 41.0-3ubuntu2
Version table:
*** 41.0-3ubuntu2 500
500 http://mirrors.sonic.net/ubuntu jammy/main amd64 Packages
100 /var/lib/dpkg/status
$ apt policy gnome-session-bin
gnome-session-bin:
Installed: 40.1.1-3ubuntu1
Candidate: 40.1.1-3ubuntu1
Version table:
*** 40.1.1-3ubuntu1 500
500 http://mirrors.sonic.net/ubuntu jammy/main amd64 Packages
100 /var/lib/dpkg/status
$ diff -u gdm3/etc/gdm3/custom.conf /etc/gdm3/custom.conf
--- gdm3/etc/gdm3/custom.conf 2021-12-08 08:06:05.000000000 -0800
+++ /etc/gdm3/custom.conf 2022-01-01 09:54:55.293144516 -0800
@@ -18,6 +18,9 @@
[security]
[xdmcp]
+Enable=true
+HonorIndirect=true
+ShowLocalGreeter=false
[chooser]
@@ -25,5 +28,5 @@
# Uncomment the line below to turn on debugging
# More verbose logs
# Additionally lets the X server dump core if it crashes
-#Enable=true
+Enable=true
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "syslog from remote session attempt"
https://bugs.launchpad.net/bugs/1956159/+attachment/5550576/+files/xdmcp-session-syslog.txt
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https://bugs.launchpad.net/bugs/1956159
Title:
XDMCP sessions show "Oh no!" screen instead of greeter
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