*** This bug is a duplicate of bug 1895420 ***
    https://bugs.launchpad.net/bugs/1895420

** This bug is no longer a duplicate of bug 1901376
   xdmcp stopped working with groovy on raspi
** This bug has been marked a duplicate of bug 1895420
   gdm3 with xdmcp does not show login box to a remote X server

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https://bugs.launchpad.net/bugs/1901450

Title:
  XDMCP does not work on Raspi Groovy while it works fine on Groovy
  Ubuntu Mate AMD64

Status in Light Display Manager:
  New
Status in lightdm package in Ubuntu:
  New

Bug description:
  The following configuration enables XDMCP of LightDM in Ubuntu Mate Groovy.
  But it fails on Groovy Raspberry Pi 64bit.

  [LightDM]
  start-default-seat=false
  lock-memory=false
  
remote-sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions:/usr/share/wayland-sessions
  [XDMCPServer]
  enabled=true
  #port=177
  listen-address=127.0.0.1

  journalctl -e shows the following:

  Oct 26 07:56:41 raspi-groovy systemd[1]: Started Session 1 of user root.
  Oct 26 07:57:10 raspi-groovy systemd[1]: 
/etc/systemd/system/Xtigervnc@.service:9: Special user nobody configured, this 
is not safe!
  Oct 26 07:57:10 raspi-groovy systemd[1]: Created slice system-Xtigervnc.slice.
  Oct 26 07:57:10 raspi-groovy systemd[1]: Starting XVNC Per-Connection Daemon 
(192.168.1.75:41812)...
  Oct 26 07:57:10 raspi-groovy systemd[1]: Started XVNC Per-Connection Daemon 
(192.168.1.75:41812).
  Oct 26 07:57:11 raspi-groovy lightdm[893]: PAM unable to 
dlopen(pam_kwallet.so): /lib/security/pam_kwallet.so: cannot open shared object 
file: No such file or directory
  Oct 26 07:57:11 raspi-groovy lightdm[893]: PAM adding faulty module: 
pam_kwallet.so
  Oct 26 07:57:11 raspi-groovy lightdm[893]: PAM unable to 
dlopen(pam_kwallet5.so): /lib/security/pam_kwallet5.so: cannot open shared 
object file: No such file or directory
  Oct 26 07:57:11 raspi-groovy lightdm[893]: PAM adding faulty module: 
pam_kwallet5.so
  Oct 26 07:57:11 raspi-groovy lightdm[893]: pam_unix(lightdm-greeter:session): 
session opened for user lightdm by (uid=0)
  Oct 26 07:57:11 raspi-groovy systemd[1]: Created slice User Slice of UID 108.
  Oct 26 07:57:11 raspi-groovy systemd[1]: Starting User Runtime Directory 
/run/user/108...
  Oct 26 07:57:11 raspi-groovy systemd-logind[530]: New session c1 of user 
lightdm.
  Oct 26 07:57:11 raspi-groovy systemd[1]: Finished User Runtime Directory 
/run/user/108.
  Oct 26 07:57:11 raspi-groovy systemd[1]: Starting User Manager for UID 108...
  Oct 26 07:57:11 raspi-groovy systemd[897]: pam_unix(systemd-user:session): 
session opened for user lightdm by (uid=0)
  Oct 26 07:57:12 raspi-groovy systemd[902]: gnome-systemd-autostart-condition 
not found: No such file or directory
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.PrintNotifications-autostart.service, 
startup phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-gnome\x2dinitial\x2dsetup\x2dcopy\x2dworker-autostart.service, 
startup phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.MediaKeys-autostart.service, startup 
phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Smartcard-autostart.service, startup 
phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-gnome\x2dkeyring\x2dsecrets-autostart.service, startup phases are 
not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-at\x2dspi\x2ddbus\x2dbus-autostart.service, startup phases are 
not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Housekeeping-autostart.service, startup 
phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: gnome-systemd-autostart-condition 
not found: No such file or directory
  Oct 26 07:57:12 raspi-groovy systemd[902]: gnome-systemd-autostart-condition 
not found: No such file or directory
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-gnome\x2dkeyring\x2dssh-autostart.service, startup phases are not 
supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Color-autostart.service, startup phases 
are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Wwan-autostart.service, startup phases 
are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-xdg\x2duser\x2ddirs-autostart.service, startup phases are not 
supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-pulseaudio-autostart.service, startup phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Rfkill-autostart.service, startup phases 
are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-gnome\x2dkeyring\x2dpkcs11-autostart.service, startup phases are 
not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.A11ySettings-autostart.service, startup 
phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.XSettings-autostart.service, startup 
phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.ScreensaverProxy-autostart.service, 
startup phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Datetime-autostart.service, startup 
phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Sound-autostart.service, startup phases 
are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Keyboard-autostart.service, startup 
phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.UsbProtection-autostart.service, startup 
phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-spice\x2dvdagent-autostart.service, startup phases are not 
supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Sharing-autostart.service, startup 
phases are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Wacom-autostart.service, startup phases 
are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[902]: Not generating service for XDG 
autostart app-org.gnome.SettingsDaemon.Power-autostart.service, startup phases 
are not supported.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Queued start job for default 
target Main User Target.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Started Pending report trigger for 
Ubuntu Report.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Reached target Paths.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Reached target Timers.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Starting D-Bus User Message Bus 
Socket.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Listening on GnuPG network 
certificate management daemon.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Listening on GnuPG cryptographic 
agent and passphrase cache (access for web browsers).
  Oct 26 07:57:12 raspi-groovy systemd[897]: Listening on GnuPG cryptographic 
agent and passphrase cache (restricted).
  Oct 26 07:57:12 raspi-groovy systemd[897]: Listening on GnuPG cryptographic 
agent (ssh-agent emulation).
  Oct 26 07:57:12 raspi-groovy systemd[897]: Listening on GnuPG cryptographic 
agent and passphrase cache.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Listening on debconf communication 
socket.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Listening on Sound System.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Listening on D-Bus User Message 
Bus Socket.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Reached target Sockets.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Reached target Basic System.
  Oct 26 07:57:12 raspi-groovy systemd[1]: Started User Manager for UID 108.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Starting Sound Service...
  Oct 26 07:57:12 raspi-groovy systemd[1]: Started Session c1 of user lightdm.
  Oct 26 07:57:12 raspi-groovy systemd[897]: Starting Tracker metadata 
extractor...
  Oct 26 07:57:12 raspi-groovy systemd[897]: Starting Tracker file system data 
miner...
  Oct 26 07:57:12 raspi-groovy lightdm[893]: gkr-pam: gnome-keyring-daemon 
started properly
  Oct 26 07:57:12 raspi-groovy lightdm[649]: Error activating login1 session: 
GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Set scheduler policy to 
SCHED_IDLE
  Oct 26 07:57:13 raspi-groovy tracker-extract[905]: Set scheduler policy to 
SCHED_IDLE
  Oct 26 07:57:13 raspi-groovy tracker-extract[905]: Setting priority nice 
level to 19
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Setting priority nice 
level to 19
  Oct 26 07:57:13 raspi-groovy systemd[897]: Started D-Bus User Message Bus.
  Oct 26 07:57:13 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
AppArmor D-Bus mediation is enabled
  Oct 26 07:57:13 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating via systemd: service name='org.gtk.vfs.Daemon' 
unit='gvfs-daemon.service' requested by ':1.1' (uid=108 pid=906 
comm="/usr/libexec/tracker-miner-fs " label="unconfined")
  Oct 26 07:57:13 raspi-groovy systemd[897]: Starting Virtual filesystem 
service...
  Oct 26 07:57:13 raspi-groovy systemd[897]: Started Sound Service.
  Oct 26 07:57:13 raspi-groovy bluetoothd[578]: Endpoint registered: 
sender=:1.54 path=/MediaEndpoint/A2DPSink/sbc
  Oct 26 07:57:13 raspi-groovy bluetoothd[578]: Endpoint registered: 
sender=:1.54 path=/MediaEndpoint/A2DPSource/sbc
  Oct 26 07:57:13 raspi-groovy kernel: Bluetooth: RFCOMM TTY layer initialized
  Oct 26 07:57:13 raspi-groovy kernel: Bluetooth: RFCOMM socket layer 
initialized
  Oct 26 07:57:13 raspi-groovy kernel: Bluetooth: RFCOMM ver 1.11
  Oct 26 07:57:13 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.gtk.vfs.Daemon'
  Oct 26 07:57:13 raspi-groovy systemd[897]: Started Virtual filesystem service.
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Unable to get XDG user 
directory path for special directory &DOCUMENTS. Ignoring this location.
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Unable to get XDG user 
directory path for special directory &MUSIC. Ignoring this location.
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Unable to get XDG user 
directory path for special directory &PICTURES. Ignoring this location.
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Unable to get XDG user 
directory path for special directory &VIDEOS. Ignoring this location.
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Unable to get XDG user 
directory path for special directory &DOWNLOAD. Ignoring this location.
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Unable to get XDG user 
directory path for special directory &DOCUMENTS. Ignoring this location.
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Unable to get XDG user 
directory path for special directory &MUSIC. Ignoring this location.
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Unable to get XDG user 
directory path for special directory &PICTURES. Ignoring this location.
  Oct 26 07:57:13 raspi-groovy tracker-miner-f[906]: Unable to get XDG user 
directory path for special directory &VIDEOS. Ignoring this location.
  Oct 26 07:57:13 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating via systemd: service name='org.gtk.vfs.UDisks2VolumeMonitor' 
unit='gvfs-udisks2-volume-monitor.service' requested by ':1.1' (uid=108 pid=906 
comm="/usr/libexec/tracker-miner-fs " label="unconfined")
  Oct 26 07:57:13 raspi-groovy systemd[897]: Starting Virtual filesystem 
service - disk device monitor...
  Oct 26 07:57:13 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.gtk.vfs.UDisks2VolumeMonitor'
  Oct 26 07:57:13 raspi-groovy systemd[897]: Started Virtual filesystem service 
- disk device monitor.
  Oct 26 07:57:13 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating via systemd: service name='org.gtk.vfs.AfcVolumeMonitor' 
unit='gvfs-afc-volume-monitor.service' requested by ':1.1' (uid=108 pid=906 
comm="/usr/libexec/tracker-miner-fs " label="unconfined")
  Oct 26 07:57:13 raspi-groovy systemd[897]: Starting Virtual filesystem 
service - Apple File Conduit monitor...
  Oct 26 07:57:14 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.gtk.vfs.AfcVolumeMonitor'
  Oct 26 07:57:14 raspi-groovy systemd[897]: Started Virtual filesystem service 
- Apple File Conduit monitor.
  Oct 26 07:57:14 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating via systemd: service name='org.gtk.vfs.GPhoto2VolumeMonitor' 
unit='gvfs-gphoto2-volume-monitor.service' requested by ':1.1' (uid=108 pid=906 
comm="/usr/libexec/tracker-miner-fs " label="unconfined")
  Oct 26 07:57:14 raspi-groovy systemd[897]: Starting Virtual filesystem 
service - digital camera monitor...
  Oct 26 07:57:14 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.gtk.vfs.GPhoto2VolumeMonitor'
  Oct 26 07:57:14 raspi-groovy systemd[897]: Started Virtual filesystem service 
- digital camera monitor.
  Oct 26 07:57:14 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating via systemd: service name='org.gtk.vfs.GoaVolumeMonitor' 
unit='gvfs-goa-volume-monitor.service' requested by ':1.1' (uid=108 pid=906 
comm="/usr/libexec/tracker-miner-fs " label="unconfined")
  Oct 26 07:57:14 raspi-groovy systemd[897]: Starting Virtual filesystem 
service - GNOME Online Accounts monitor...
  Oct 26 07:57:14 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating service name='org.gnome.OnlineAccounts' requested by ':1.9' (uid=108 
pid=962 comm="/usr/libexec/gvfs-goa-volume-monitor " label="unconfined")
  Oct 26 07:57:15 raspi-groovy goa-daemon[966]: goa-daemon version 3.37.90 
starting
  Oct 26 07:57:15 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating service name='org.gnome.Identity' requested by ':1.10' (uid=108 
pid=966 comm="/usr/libexec/goa-daemon " label="unconfined")
  Oct 26 07:57:15 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.gnome.OnlineAccounts'
  Oct 26 07:57:15 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.gtk.vfs.GoaVolumeMonitor'
  Oct 26 07:57:15 raspi-groovy systemd[897]: Started Virtual filesystem service 
- GNOME Online Accounts monitor.
  Oct 26 07:57:15 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.gnome.Identity'
  Oct 26 07:57:15 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating via systemd: service name='org.gtk.vfs.MTPVolumeMonitor' 
unit='gvfs-mtp-volume-monitor.service' requested by ':1.1' (uid=108 pid=906 
comm="/usr/libexec/tracker-miner-fs " label="unconfined")
  Oct 26 07:57:15 raspi-groovy systemd[897]: Starting Virtual filesystem 
service - Media Transfer Protocol monitor...
  Oct 26 07:57:15 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.gtk.vfs.MTPVolumeMonitor'
  Oct 26 07:57:15 raspi-groovy systemd[897]: Started Virtual filesystem service 
- Media Transfer Protocol monitor.
  Oct 26 07:57:15 raspi-groovy dbus-daemon[510]: [system] Activating via 
systemd: service name='org.freedesktop.UPower' unit='upower.service' requested 
by ':1.62' (uid=108 pid=906 comm="/usr/libexec/tracker-miner-fs " 
label="unconfined")
  Oct 26 07:57:15 raspi-groovy systemd[1]: Starting Daemon for power 
management...
  Oct 26 07:57:15 raspi-groovy systemd[897]: Started Tracker metadata extractor.
  Oct 26 07:57:15 raspi-groovy dbus-daemon[510]: [system] Successfully 
activated service 'org.freedesktop.UPower'
  Oct 26 07:57:15 raspi-groovy systemd[1]: Started Daemon for power management.
  Oct 26 07:57:15 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating via systemd: service name='org.freedesktop.Tracker1' 
unit='tracker-store.service' requested by ':1.1' (uid=108 pid=906 
comm="/usr/libexec/tracker-miner-fs " label="unconfined")
  Oct 26 07:57:15 raspi-groovy systemd[897]: Starting Tracker metadata database 
store and lookup manager...
  Oct 26 07:57:16 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.freedesktop.Tracker1'
  Oct 26 07:57:16 raspi-groovy systemd[897]: Started Tracker metadata database 
store and lookup manager.
  Oct 26 07:57:17 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating via systemd: service name='org.a11y.Bus' 
unit='at-spi-dbus-bus.service' requested by ':1.14' (uid=108 pid=913 
comm="/usr/sbin/lightdm-gtk-greeter " label="unconfined")
  Oct 26 07:57:17 raspi-groovy systemd[897]: Starting Accessibility services 
bus...
  Oct 26 07:57:17 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.a11y.Bus'
  Oct 26 07:57:17 raspi-groovy systemd[897]: Started Accessibility services bus.
  Oct 26 07:57:17 raspi-groovy systemd[897]: Started Tracker file system data 
miner.
  Oct 26 07:57:17 raspi-groovy systemd[897]: Reached target Main User Target.
  Oct 26 07:57:17 raspi-groovy systemd[897]: Startup finished in 5.773s.
  Oct 26 07:57:18 raspi-groovy lightdm[893]: pam_unix(lightdm-greeter:session): 
session closed for user lightdm
  Oct 26 07:57:18 raspi-groovy lightdm[649]: instance with invalid (NULL) class 
pointer
  Oct 26 07:57:18 raspi-groovy lightdm[649]: g_signal_emit_valist: assertion 
'G_TYPE_CHECK_INSTANCE (instance)' failed
  Oct 26 07:57:18 raspi-groovy systemd-logind[530]: Session c1 logged out. 
Waiting for processes to exit.
  Oct 26 07:57:18 raspi-groovy bluetoothd[578]: Endpoint unregistered: 
sender=:1.54 path=/MediaEndpoint/A2DPSink/sbc
  Oct 26 07:57:18 raspi-groovy bluetoothd[578]: Endpoint unregistered: 
sender=:1.54 path=/MediaEndpoint/A2DPSource/sbc
  Oct 26 07:57:18 raspi-groovy systemd[897]: pulseaudio.service: Succeeded.
  Oct 26 07:57:18 raspi-groovy systemd[1]: 
Xtigervnc@0-192.168.1.83:5901-192.168.1.75:41812.service: Succeeded.
  Oct 26 07:57:18 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Activating via systemd: service name='org.gtk.vfs.Metadata' 
unit='gvfs-metadata.service' requested by ':1.2' (uid=108 pid=905 
comm="/usr/libexec/tracker-extract " label="unconfined")
  Oct 26 07:57:18 raspi-groovy systemd[897]: Starting Virtual filesystem 
metadata service...
  Oct 26 07:57:18 raspi-groovy dbus-daemon[915]: [session uid=108 pid=915] 
Successfully activated service 'org.gtk.vfs.Metadata'
  Oct 26 07:57:18 raspi-groovy systemd[897]: Started Virtual filesystem 
metadata service.
  Oct 26 07:57:30 raspi-groovy systemd[897]: tracker-extract.service: Succeeded.
  Oct 26 07:57:30 raspi-groovy systemd[897]: tracker-extract.service: Consumed 
1.103s CPU time.

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