root@debian-imx6:/var/log/lightdm# cat lightdm.log.old
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.8.5, UID=0 PID=2804
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/01_debian.conf
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.03s] DEBUG: Registered seat module xlocal
[+0.03s] DEBUG: Registered seat module xremote
[+0.04s] DEBUG: Registered seat module unity
[+0.04s] DEBUG: Registered seat module surfaceflinger
[+0.04s] DEBUG: Adding default seat
[+0.04s] DEBUG: Seat: Starting
[+0.04s] DEBUG: Seat: Creating greeter session
[+0.04s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+0.04s] DEBUG: Seat: Creating display server of type x
[+0.04s] DEBUG: Seat: Starting local X display
[+0.04s] DEBUG: Could not run plymouth --ping: Failed to execute child process "plymouth" (No such file or directory)
[+0.04s] DEBUG: Using VT 7
[+0.04s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log
[+0.04s] DEBUG: DisplayServer x-0: Writing X server authority to /var/run/lightdm/root/:0
[+0.04s] DEBUG: DisplayServer x-0: Launching X Server
[+0.04s] DEBUG: Launching process 2858: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.04s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0
[+0.05s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.05s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+1.27s] DEBUG: Got signal 10 from process 2858
[+1.27s] DEBUG: DisplayServer x-0: Got signal from X server :0
[+1.27s] DEBUG: DisplayServer x-0: Connecting to XServer :0
[+1.27s] DEBUG: Seat: Display server ready, starting session authentication
[+1.27s] DEBUG: Session: Setting XDG_VTNR=7
[+1.27s] DEBUG: Session pid=2866: Started with service 'lightdm-greeter', username 'lightdm'
[+1.32s] DEBUG: Session pid=2866: Authentication complete with return value 0: Success
[+1.32s] DEBUG: Seat: Session authenticated, running command
[+1.32s] DEBUG: Session pid=2866: Setting XDG_VTNR=7
[+1.32s] DEBUG: Session pid=2866: Running command /usr/sbin/lightdm-gtk-greeter
[+1.32s] DEBUG: org.freedesktop.Accounts does not exist, falling back to passwd file
[+1.32s] DEBUG: Session pid=2866: Logging to /var/log/lightdm/x-0-greeter.log
[+1.69s] DEBUG: Activating VT 7
[+1.69s] WARNING: Error using VT_ACTIVATE 7 on /dev/console: Invalid argument
[+1.69s] WARNING: Error using VT_WAITACTIVE 7 on /dev/console: Invalid argument
[+1.69s] DEBUG: Session pid=2866: Greeter closed communication channel
[+1.69s] DEBUG: Session pid=2866: Exited with return value 1
[+1.69s] DEBUG: Seat: Session stopped
[+1.69s] DEBUG: Seat: Stopping; failed to start a greeter
[+1.69s] DEBUG: Seat: Stopping
[+1.69s] DEBUG: Seat: Stopping display server
[+1.69s] DEBUG: Sending signal 15 to process 2858
[+2.21s] DEBUG: Process 2858 exited with return value 0
[+2.21s] DEBUG: DisplayServer x-0: X server stopped
[+2.21s] DEBUG: Releasing VT 7
[+2.21s] DEBUG: DisplayServer x-0: Removing X server authority /var/run/lightdm/root/:0
[+2.21s] DEBUG: Seat: Display server stopped
[+2.21s] DEBUG: Seat: Stopped
[+2.21s] DEBUG: Required seat has stopped
[+2.21s] DEBUG: Stopping display manager
[+2.21s] DEBUG: Display manager stopped
[+2.21s] DEBUG: Stopping daemon
[+2.21s] DEBUG: Releasing VT 7
[+2.22s] DEBUG: Exiting with return value 1