lightdm login fails on 2nd and subsequent connection

After upgrade to 16.04.1 from 14.04 I'm getting problems with lightdm.

Here's what I see in syslog after a first (successful) login

Code:

Jul 30 10:51:36 Charon lightdm[4444]: (lightdm:4444): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jul 30 10:51:36 Charon systemd[1]: Started Session c2 of user lightdm.
Jul 30 10:51:36 Charon lightdm[4444]: (lightdm:4444): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jul 30 10:51:36 Charon systemd[1]: Started Session c2 of user lightdm.
Jul 30 10:51:36 Charon lightdm[4444]: ** (lightdm:4444): WARNING **: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
Jul 30 10:51:36 Charon org.a11y.atspi.Registry[8379]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
Jul 30 10:51:37 Charon systemd[1]: Started Run anacron jobs.
Jul 30 10:51:37 Charon anacron[8502]: Anacron 2.3 started on 2016-07-30
Jul 30 10:51:37 Charon anacron[8502]: Will run job `cron.daily' in 5 min.
Jul 30 10:51:37 Charon anacron[8502]: Will run job `cron.monthly' in 15 min.
Jul 30 10:51:37 Charon anacron[8502]: Jobs will be executed sequentially
Jul 30 10:51:42 Charon org.gtk.vfs.Daemon[8370]: A connection to the bus can't be made
Jul 30 10:51:42 Charon systemd[1]: Created slice User Slice of amonra.
Jul 30 10:51:42 Charon systemd[1]: Started Session c3 of user amonra.
Jul 30 10:51:42 Charon systemd[1]: Starting User Manager for UID 1000...
Jul 30 10:51:42 Charon systemd[8649]: Reached target Paths.
Jul 30 10:51:42 Charon systemd[8649]: Reached target Sockets.
Jul 30 10:51:42 Charon systemd[8649]: Reached target Timers.
Jul 30 10:51:42 Charon systemd[8649]: Reached target Basic System.
Jul 30 10:51:42 Charon systemd[8649]: Reached target Default.
Jul 30 10:51:42 Charon systemd[8649]: Startup finished in 85ms.
Jul 30 10:51:42 Charon systemd[1]: Started User Manager for UID 1000.
Jul 30 10:51:42 Charon lightdm[4444]: ** (lightdm:4444): WARNING **: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
Jul 30 10:51:43 Charon org.a11y.Bus[8721]: Activating service name='org.a11y.atspi.Registry'
Jul 30 10:51:43 Charon org.a11y.Bus[8721]: ** (process:8819): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

If I logout and then attempt to reconnect, I get the greeter login prompt and when I press enter to login, the X session closes, and this is what I see in syslog

Code:

Jul 30 10:57:10 Charon anacron[8502]: Job `cron.daily' terminated
Jul 30 11:00:25 Charon systemd[1]: Started CUPS Scheduler.
Jul 30 11:02:01 Charon systemd[1]: Starting Cleanup of Temporary Directories...
Jul 30 11:02:01 Charon systemd-tmpfiles[16744]: [/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log", ignoring.
Jul 30 11:02:01 Charon systemd[1]: Started Cleanup of Temporary Directories.
Jul 30 11:03:32 Charon systemd[1]: Stopping Run anacron jobs...
Jul 30 11:03:32 Charon systemd[1]: Stopped Run anacron jobs.
Jul 30 11:04:05 Charon lightdm[4444]: (lightdm:4444): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jul 30 11:04:05 Charon systemd[1]: Started Session c4 of user lightdm.
Jul 30 11:04:05 Charon lightdm[4444]: ** (lightdm:4444): WARNING **: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
Jul 30 11:04:06 Charon systemd[1]: Started Run anacron jobs.
Jul 30 11:04:06 Charon anacron[18619]: Anacron 2.3 started on 2016-07-30
Jul 30 11:04:06 Charon anacron[18619]: Will run job `cron.monthly' in 15 min.
Jul 30 11:04:06 Charon anacron[18619]: Jobs will be executed sequentially
Jul 30 11:04:12 Charon systemd[1]: Started Session c5 of user amonra.
Jul 30 11:04:12 Charon lightdm[4444]: ** (lightdm:4444): WARNING **: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
Jul 30 11:04:44 Charon systemd[1]: Stopping Run anacron jobs...
Jul 30 11:04:44 Charon systemd[1]: Stopped Run anacron jobs.
Jul 30 11:05:28 Charon systemd[1]: Started Run anacron jobs.
Jul 30 11:05:28 Charon anacron[19872]: Anacron 2.3 started on 2016-07-30
Jul 30 11:05:28 Charon anacron[19872]: Will run job `cron.monthly' in 15 min.
Jul 30 11:05:28 Charon anacron[19872]: Jobs will be executed sequentially
Jul 30 11:06:15 Charon systemd[1]: Started Session 1 of user amonra.
Jul 30 11:09:01 Charon CRON[22656]: (root) CMD (  [ -x /usr/lib/php5/maxlifetime ] && [ -x /usr/lib/php5/sessionclean ] && [ -d /var/lib/php5 ] && /usr/lib/php5/sessionclean /var/lib/php5 $(/usr/lib/php5/maxlifetime))

I realise that's not much to go on, but the only thing I spot is the second log doesn't show the message:

Started User Manager for UID 1000.

looking in the /var/log/lightdm, I see

File: /var/log/lightdm/seat0-greeter.log

Code:

* Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf

** (process:4451): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
Activating service name='org.a11y.atspi.Registry'
Successfully activated service 'org.a11y.atspi.Registry'
upstart: indicator-application main process (4499) killed by TERM signal
upstart: indicator-application main process ended, respawning
upstart: indicator-application main process (28768) killed by TERM signal
upstart: indicator-application pre-stop process (28799) killed by HUP signal
** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf

** (process:4301): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
Activating service name='org.a11y.atspi.Registry'
Successfully activated service 'org.a11y.atspi.Registry'
upstart: indicator-application main process (4350) killed by TERM signal
** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf

** (process:4619): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
Activating service name='org.a11y.atspi.Registry'
Successfully activated service 'org.a11y.atspi.Registry'

File: /var/log/lightdm/(null)-greeter.log

Code:

** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf

** (process:4913): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
Activating service name='org.a11y.atspi.Registry'
Successfully activated service 'org.a11y.atspi.Registry'
upstart: indicator-application main process (4953) killed by TERM signal
** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf
Failed to launch bus: Failed to connect to session buslibGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
upstart: indicator-application main process ended, respawning
upstart: indicator-application main process ended, respawning
upstart: indicator-application respawning too fast, stopped
/usr/lib/lightdm/lightdm-greeter-session: 23: kill: No such process


** (lightdm-gtk-greeter:26282): WARNING **: [PIDs] Failed to terminate process #26284: No such process
** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf
Failed to launch bus: Failed to connect to session buslibGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
upstart: indicator-application main process ended, respawning
upstart: indicator-application main process ended, respawning
upstart: indicator-application respawning too fast, stopped

(lightdm-gtk-greeter:26464): Gdk-WARNING **: lightdm-gtk-greeter: Fatal IO error 11 (Resource temporarily unavailable) on X server 192.168.129.64:0.

/usr/lib/lightdm/lightdm-greeter-session: 23: kill: No such process

** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf
Failed to launch bus: Failed to connect to session buslibGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
upstart: indicator-application main process ended, respawning
upstart: indicator-application main process ended, respawning
upstart: indicator-application respawning too fast, stopped
/usr/lib/lightdm/lightdm-greeter-session: 23: kill: No such process


** (lightdm-gtk-greeter:26763): WARNING **: [PIDs] Failed to terminate process #26777: No such process
** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf
Failed to launch bus: Failed to connect to session buslibGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
upstart: indicator-application main process ended, respawning
upstart: indicator-application main process ended, respawning
upstart: indicator-application respawning too fast, stopped
/usr/lib/lightdm/lightdm-greeter-session: 23: kill: No such process


** (lightdm-gtk-greeter:27283): WARNING **: [PIDs] Failed to terminate process #27285: No such process
** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf
Failed to launch bus: Failed to connect to session buslibGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
upstart: indicator-application main process ended, respawning
upstart: indicator-application main process ended, respawning
upstart: indicator-application respawning too fast, stopped

(lightdm-gtk-greeter:28006): Gdk-WARNING **: lightdm-gtk-greeter: Fatal IO error 11 (Resource temporarily unavailable) on X server 192.168.129.64:0.

/usr/lib/lightdm/lightdm-greeter-session: 23: kill: No such process

** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf

** (process:4639): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
Activating service name='org.a11y.atspi.Registry'
Successfully activated service 'org.a11y.atspi.Registry'
upstart: indicator-application main process (4667) killed by TERM signal
** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf
Failed to launch bus: Failed to connect to session buslibGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
upstart: indicator-application main process ended, respawning
upstart: indicator-application main process ended, respawning
upstart: indicator-application respawning too fast, stopped
/usr/lib/lightdm/lightdm-greeter-session: 23: kill: No such process


** (lightdm-gtk-greeter:11549): WARNING **: [PIDs] Failed to terminate process #11551: No such process
** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf

** (process:8373): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
Activating service name='org.a11y.atspi.Registry'
Successfully activated service 'org.a11y.atspi.Registry'
upstart: indicator-application main process (8404) terminated with status 1
upstart: indicator-application main process ended, respawning

** (lightdm-gtk-greeter:8371): WARNING **: [PIDs] Failed to terminate process #8373: No such process
upstart: indicator-application main process (8644) killed by TERM signal
** Message: Starting lightdm-gtk-greeter 2.0.1 (Apr 11 2016, 06:05:31)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf
Failed to launch bus: Failed to connect to session buslibGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
upstart: indicator-application main process ended, respawning
upstart: indicator-application main process ended, respawning
upstart: indicator-application respawning too fast, stopped
/usr/lib/lightdm/lightdm-greeter-session: 23: kill: No such process


** (lightdm-gtk-greeter:18500): WARNING **: [PIDs] Failed to terminate process #18502: No such process

File: /var/log/lightdm/lightdm.log

Code:

[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.18.2, UID=0 PID=4444
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/20-lubuntu.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-disable-log-backup.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf.d/20-lubuntu.conf
[+0.00s] DEBUG:   [SeatDefaults] is now called [Seat:*], please update this configuration
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG:   [SeatDefaults] is now called [Seat:*], please update this configuration
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Registered seat module xlocal
[+0.01s] DEBUG: Registered seat module xremote
[+0.01s] DEBUG: Registered seat module unity
[+0.04s] DEBUG: Monitoring logind for seats
[+0.04s] DEBUG: New seat added from logind: seat0
[+0.04s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.04s] DEBUG: Seat seat0: Starting
[+0.04s] DEBUG: Seat seat0: Creating greeter session
[+0.04s] DEBUG: Seat seat0: Creating display server of type x
[+0.06s] DEBUG: Using VT 7
[+0.06s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.06s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log
[+0.06s] DEBUG: DisplayServer x-0: Writing X server authority to /var/run/lightdm/root/:0
[+0.17s] DEBUG: DisplayServer x-0: Launching X Server
[+0.17s] DEBUG: Launching process 4463: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -listen tcp vt7 -novtswitch
[+0.17s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0
[+0.17s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.18s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.18s] DEBUG: Starting XDMCP server on UDP/IP port 177
[+0.20s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.20s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+1.82s] DEBUG: Got signal 10 from process 4463
[+1.82s] DEBUG: DisplayServer x-0: Got signal from X server :0
[+1.82s] DEBUG: DisplayServer x-0: Connecting to XServer :0
[+1.84s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+1.84s] DEBUG: Session pid=4565: Started with service 'lightdm-greeter', username 'lightdm'
[+1.99s] DEBUG: Session pid=4565: Authentication complete with return value 0: Success
[+1.99s] DEBUG: Seat seat0: Session authenticated, running command
[+1.99s] DEBUG: Session pid=4565: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/lightdm-gtk-greeter
[+1.99s] DEBUG: Creating shared data directory /var/lib/lightdm-data/lightdm
[+1.99s] DEBUG: Session pid=4565: Logging to /var/log/lightdm/seat0-greeter.log
[+2.52s] DEBUG: Activating VT 7
[+2.52s] DEBUG: Activating login1 session c1
[+2.55s] DEBUG: Seat seat0 changes active session to c1
[+2.55s] DEBUG: Session c1 is already active
[+4.00s] DEBUG: Greeter connected version=1.18.2 resettable=false
[+5.97s] DEBUG: Greeter start authentication for amonra
[+5.97s] DEBUG: Session pid=4720: Started with service 'lightdm', username 'amonra'
[+6.04s] DEBUG: Session pid=4720: Got 1 message(s) from PAM
[+6.04s] DEBUG: Prompt greeter with 1 message(s)
[+238.45s] DEBUG: Got Query(authentication_names=[]) from 192.168.129.64:61250
[+238.45s] DEBUG: Send Willing(authentication_name='' hostname='Charon' status='') to 192.168.129.64:61250
[+238.82s] DEBUG: Got Request(display_number=0 connections=[192.168.129.64] authentication_name='' authentication_data= authorization_names=['MIT-MAGIC-COOKIE-1' 'XDM-AUTHORIZATION-1'] manufacturer_display_id='') from 192.168.129.64:61250
[+238.82s] CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[+238.82s] DEBUG: Send Accept(session_id=6899 authentication_name='' authentication_data= authorization_name='MIT-MAGIC-COOKIE-1' authorization_data=F1E5579274A9CF3D1E6A91CD55EA7E12) to 192.168.129.64:61250
[+238.82s] DEBUG: Got Manage(session_id=6899 display_number=0 display_class='MIT-unspecified') from 192.168.129.64:61250
[+238.82s] DEBUG: Seat (null): Loading properties from config section Seat:*
[+238.82s] DEBUG: Seat (null): Starting
[+238.82s] DEBUG: Seat (null): Creating greeter session
[+238.82s] DEBUG: Seat (null): Creating display server of type x
[+238.82s] DEBUG: DisplayServer x-192.168.129.64-0: Connecting to XServer 192.168.129.64:0
[+238.83s] DEBUG: Seat (null): Display server ready, starting session authentication
[+238.83s] DEBUG: Session: Not setting XDG_VTNR
[+238.83s] DEBUG: Session pid=8362: Started with service 'lightdm-greeter', username 'lightdm'
[+238.84s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat1
[+238.87s] DEBUG: Session pid=8362: Authentication complete with return value 0: Success
[+238.87s] DEBUG: Seat (null): Session authenticated, running command
[+238.87s] DEBUG: Session pid=8362: Not setting XDG_VTNR
[+238.87s] DEBUG: Session pid=8362: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/lightdm-gtk-greeter
[+238.87s] DEBUG: Session pid=8362: Logging to /var/log/lightdm/(null)-greeter.log
[+238.90s] DEBUG: Activating login1 session c2
[+238.91s] WARNING: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
[+239.61s] DEBUG: Greeter connected version=1.18.2 resettable=false
[+240.41s] DEBUG: Greeter start authentication for amonra
[+240.41s] DEBUG: Session: Not setting XDG_VTNR
[+240.41s] DEBUG: Session pid=8562: Started with service 'lightdm', username 'amonra'
[+240.44s] DEBUG: Session pid=8562: Got 1 message(s) from PAM
[+240.44s] DEBUG: Prompt greeter with 1 message(s)
[+244.44s] DEBUG: Continue authentication
[+244.48s] DEBUG: Session pid=8562: Authentication complete with return value 0: Success
[+244.48s] DEBUG: Authenticate result for user amonra: Success
[+244.48s] DEBUG: User amonra authorized
[+244.50s] DEBUG: Greeter sets language en_GB
[+244.80s] DEBUG: Greeter requests session Lubuntu
[+244.80s] DEBUG: Seat (null): Stopping greeter; display server will be re-used for user session
[+244.80s] DEBUG: Session pid=8362: Sending SIGTERM
[+244.83s] DEBUG: Session pid=8362: Exited with return value 0
[+244.83s] DEBUG: Seat (null): Session stopped
[+244.83s] DEBUG: Seat (null): Greeter stopped, running session
[+244.83s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session0
[+244.85s] DEBUG: Session pid=8562: Not setting XDG_VTNR
[+244.86s] DEBUG: Session pid=8562: Running command /usr/sbin/lightdm-session /usr/bin/lxsession -s Lubuntu -e LXDE
[+244.86s] DEBUG: Session pid=8562: Logging to .xsession-errors
[+245.05s] DEBUG: Activating login1 session c3
[+245.05s] WARNING: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
[+923.66s] DEBUG: Session pid=8562: Exited with return value 0
[+923.66s] DEBUG: Seat (null): Session stopped
[+923.66s] DEBUG: Seat (null): Stopping display server, no sessions require it
[+923.66s] DEBUG: Seat (null): Display server stopped
[+923.66s] DEBUG: Seat (null): Active display server stopped, starting greeter
[+923.66s] DEBUG: Seat (null): Stopping; failed to start a greeter
[+923.66s] DEBUG: Seat (null): Stopping
[+923.66s] DEBUG: Seat (null): Stopped
[+987.94s] DEBUG: Got Query(authentication_names=[]) from 192.168.129.64:64466
[+987.94s] DEBUG: Send Willing(authentication_name='' hostname='Charon' status='') to 192.168.129.64:64466
[+988.16s] DEBUG: Got Request(display_number=0 connections=[192.168.129.64] authentication_name='' authentication_data= authorization_names=['MIT-MAGIC-COOKIE-1' 'XDM-AUTHORIZATION-1'] manufacturer_display_id='') from 192.168.129.64:64466
[+988.16s] CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[+988.16s] DEBUG: Send Accept(session_id=24477 authentication_name='' authentication_data= authorization_name='MIT-MAGIC-COOKIE-1' authorization_data=3781F5E0763ABC87842DCC5C69507DB0) to 192.168.129.64:64466
[+988.16s] DEBUG: Got Manage(session_id=24477 display_number=0 display_class='MIT-unspecified') from 192.168.129.64:64466
[+988.16s] DEBUG: Seat (null): Loading properties from config section Seat:*
[+988.16s] DEBUG: Seat (null): Starting
[+988.16s] DEBUG: Seat (null): Creating greeter session
[+988.16s] DEBUG: Seat (null): Creating display server of type x
[+988.16s] DEBUG: DisplayServer x-192.168.129.64-0: Connecting to XServer 192.168.129.64:0
[+988.17s] DEBUG: Seat (null): Display server ready, starting session authentication
[+988.17s] DEBUG: Session: Not setting XDG_VTNR
[+988.17s] DEBUG: Session pid=18491: Started with service 'lightdm-greeter', username 'lightdm'
[+988.17s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat2
[+988.21s] DEBUG: Session pid=18491: Authentication complete with return value 0: Success
[+988.21s] DEBUG: Seat (null): Session authenticated, running command
[+988.21s] DEBUG: Session pid=18491: Not setting XDG_VTNR
[+988.21s] DEBUG: Session pid=18491: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/lightdm-gtk-greeter
[+988.21s] DEBUG: Session pid=18491: Logging to /var/log/lightdm/(null)-greeter.log
[+988.24s] DEBUG: Activating login1 session c4
[+988.24s] WARNING: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
[+988.66s] DEBUG: Greeter connected version=1.18.2 resettable=false
[+989.49s] DEBUG: Greeter start authentication for amonra
[+989.49s] DEBUG: Session: Not setting XDG_VTNR
[+989.49s] DEBUG: Session pid=18680: Started with service 'lightdm', username 'amonra'
[+989.51s] DEBUG: Session pid=18680: Got 1 message(s) from PAM
[+989.51s] DEBUG: Prompt greeter with 1 message(s)
[+994.85s] DEBUG: Continue authentication
[+994.92s] DEBUG: Session pid=18680: Authentication complete with return value 0: Success
[+994.92s] DEBUG: Authenticate result for user amonra: Success
[+994.92s] DEBUG: User amonra authorized
[+994.93s] DEBUG: Greeter sets language en_GB
[+995.23s] DEBUG: Greeter requests session Lubuntu
[+995.23s] DEBUG: Seat (null): Stopping greeter; display server will be re-used for user session
[+995.23s] DEBUG: Session pid=18491: Sending SIGTERM
[+995.24s] DEBUG: Greeter closed communication channel
[+995.25s] DEBUG: Session pid=18491: Exited with return value 0
[+995.25s] DEBUG: Seat (null): Session stopped
[+995.25s] DEBUG: Seat (null): Greeter stopped, running session
[+995.25s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session1
[+995.26s] DEBUG: Session pid=18680: Not setting XDG_VTNR
[+995.26s] DEBUG: Session pid=18680: Running command /usr/sbin/lightdm-session /usr/bin/lxsession -s Lubuntu -e LXDE
[+995.26s] DEBUG: Session pid=18680: Logging to .xsession-errors
[+995.29s] DEBUG: Activating login1 session c5
[+995.30s] WARNING: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
[+1505.74s] DEBUG: Session pid=18680: Exited with return value 0
[+1505.74s] DEBUG: Seat (null): Session stopped
[+1505.74s] DEBUG: Seat (null): Stopping display server, no sessions require it
[+1505.74s] DEBUG: Seat (null): Display server stopped
[+1505.74s] DEBUG: Seat (null): Active display server stopped, starting greeter
[+1505.74s] DEBUG: Seat (null): Stopping; failed to start a greeter
[+1505.74s] DEBUG: Seat (null): Stopping
[+1505.74s] DEBUG: Seat (null): Stopped

Thanks
Dave

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lightdm login fails on 2nd and subsequent connection

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