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Thread: lightdm login fails on 2nd and subsequent connection

  1. #1
    Join Date
    Mar 2016
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    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

  2. #2
    Join Date
    Aug 2016
    Beans
    2

    Re: lightdm login fails on 2nd and subsequent connection

    I am seeing the same problem. I installed
    ubuntu-gnome-16.04.1-desktop-amd64.iso
    on an Intel NUC6i5SYH with
    Intel® Core™ i5-6260U CPU @ 1.80GHz × 4 and
    Intel® Iris Graphics 540 (Skylake GT3e).
    I then installed lightdm and xfce4 with the
    Synaptic Package Manager. Local logins work fine with
    GDM, LighttDM, GNOME and Xfce.

    However, remote XDMCP login from a VcXsrv X server running
    on a Windows 10 computer works only once for each boot up
    of the ubuntu system. On the second and subsequent remote
    login attempts, after entering the password and proceeding,
    the screen flicker twice and returns to the login screen.

    The syslog for the failing logins diverges from the good
    login at:
    Aug 1 18:44:44 nucunifi systemd[4395]:
    Startup finished in 24ms.
    Aug 1 18:44:44 nucunifi systemd[1]:
    Started User Manager for UID 1000.
    Aug 1 18:44:44 nucunifi lightdm[3177]:
    ** (lightdm:3177): WARNING **: Error activating login1 session:
    GDBus.Errorrg.freedesktop.DBus.Error.NotSupported:
    Operation not supported
    Aug 1 18:44:44 nucunifi lightdm[3177]:
    (lightdm:3177): GLib-GObject-CRITICAL **: g_object_unref:
    assertion 'G_IS_OBJECT (object)' failed
    Aug 1 18:44:44 nucunifi systemd[1]:
    Started Session c6 of user lightdm.
    Aug 1 18:44:44 nucunifi lightdm[3177]:
    ** (lightdm:3177): WARNING **: Error activating login1 session:
    GDBus.Errorrg.freedesktop.DBus.Error.NotSupported:
    Operation not supported
    Aug 1 18:44:46 nucunifi systemd[1]:
    Stopping User Manager for UID 1000...
    Aug 1 18:44:46 nucunifi systemd[4395]:
    Reached target Shutdown.

    Any ideas on how to get this to work?

  3. #3
    Join Date
    Mar 2016
    Beans
    125

    Re: lightdm login fails on 2nd and subsequent connection

    Good to see I'm not alone. My failures are also when using XDMCP.

    Hope that someone can resolve this. If you can please also join the lightdm mailing list and report the problem there:

    https://lists.freedesktop.org/mailman/listinfo/lightdm

    Cheers
    Dave
    Last edited by David_Partridge; August 2nd, 2016 at 09:36 AM.

  4. #4
    Join Date
    Mar 2016
    Beans
    125

    Re: lightdm login fails on 2nd and subsequent connection

    I spotted the bug report for lightdm: <https://bugs.launchpad.net/lightdm/+bug/1599478> which looks mightily like this problem.

    I grabbed the following from the "yakkety" repository:

    I plucked up my courage and installed:

    libgcrypt20_1.7.2-2 and
    lightdm_1.19.3-0ubuntu1

    from the yakkety repository.

    This seems to resolve the problem.

    How do I add the yakkety repository for just these two packages on 16.04.1? Or is that not possible?

  5. #5
    Join Date
    Aug 2016
    Beans
    2

    Re: lightdm login fails on 2nd and subsequent connection

    I have verified the above solution. I spun up A VM using "ubuntu-gnome-16.04.1-desktop-amd64.iso" and installed the default lightdm 1.18.2 package. I was then able to do one and only one XDMCP login per boot up of the Ubuntu host. I then did "dpkg -i libgcrypt20_1.7.2-2_amd64.deb" (a prerequisite for the new lightdm) and "dpkg -i lightdm_1.19.3-0ubuntu1_amd64.deb" to install lightdm version 1.19.3. Now I can do multiple XDMCP logins to multiple users without any trouble.

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