Hi Yves-Alexis,

Thanks for your follow-up.

[ dm tools & loginct ]
< with lightdm & liblightdm-gobject-1-0 1.33.0-1 >

$ dm-tool list-seats
Seat0
  CanSwitch=false
  HasGuestAccount=false
  Session0
    UserName='f'

=> "CanSwitch=false" I did not configure that => seems default. Unsure if it 
means switching users or not.

$ dm-tool lock
Unable to lock seat: GDBus.Error:org.freedesktop.DBus.Error.Failed: Failed to 
lock seat

$ dm-tool --session-bus switch-to-greeter
Unable to switch to greeter: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
org.freedesktop.DisplayManager was not provided by any .service files

$ loginctl
SESSION  UID USER SEAT  LEADER CLASS   TTY IDLE SINCE
      2 1000 f    seat0 1915   user    -   no   -    
      3 1000 f    -     2128   manager -   no   -    

2 sessions listed.


< with lightdm & liblightdm-gobject-1-0 1.32.0-7 >

$ dm-tool list-seats
Seat0
  CanSwitch=true
  HasGuestAccount=false
  Session0
    UserName='f'

=> Now "CanSwitch=true".  I did not change any config file between 1.33 & 1.32, 
just reinstalled 1.32 & rebooted.

$ dm-tool lock
lock the screen as expected (and I can return later to Xorg)

$ dm-tool --session-bus switch-to-greeter
Unable to switch to greeter: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
org.freedesktop.DisplayManager was not provided by any .service files

=> same as with 1.33

$ loginctl
SESSION  UID USER SEAT  LEADER CLASS   TTY IDLE SINCE
      2 1000 f    seat0 1919   user    -   no   -    
      3 1000 f    -     2116   manager -   no   -    

2 sessions listed.

=> same as with 1.33


< difference >
1.33 : CanSwitch=false
1.32 : CanSwitch=true
only due to package, not to any user config file change

cd /etc/lightdm
1.32:
# grep -ri switch
lightdm.conf:# allow-user-switching = True if allowed to switch users
lightdm.conf:#allow-user-switching=true

1.33:
# grep -ri switch
lightdm.conf:# allow-user-switching = True if allowed to switch users
lightdm.conf:#allow-user-switching=true

=> same as 1.32.


[ no help: 1.33 with allow-user-switching=true ]
vi /etc/lightdm/lightdm.conf.d/10_fr_changes_lightdm.conf
/etc/lightdm/lightdm.conf
before:
[Seat:*]
greeter-hide-users=false

now putting:
[Seat:*]
greeter-hide-users=false
allow-user-switching=true

reboot

$ dm-tool list-seats
Seat0
  CanSwitch=false
  HasGuestAccount=false
  Session0
    UserName='f'

=> still "CanSwitch=false" !
but 1.32 & you with 1.33 have "CanSwitch=true"...why ?

$ dm-tool switch-to-greeter
Unable to switch to greeter: GDBus.Error:org.freedesktop.DBus.Error.Failed: 
Failed to switch to greeter

# lightdm --show-config
   [Seat:*]
A  greeter-session=lightdm-greeter
B  greeter-hide-users=false
A  session-wrapper=/etc/X11/Xsession
B  allow-user-switching=true

Sources:
A  /usr/share/lightdm/lightdm.conf.d/01_debian.conf
B  /etc/lightdm/lightdm.conf.d/10_fr_changes_lightdm.conf
C  /etc/lightdm/lightdm.conf


[ checking logs before/after dm-tool switch-to-greeter ]
with 1.32:
# cp /var/log/lightdm/lightdm.log 
/tmp/lightdm.log-with_1.32.0-7-before_switch.txt
$ dm-tool switch-to-greeter
# cp /var/log/lightdm/lightdm.log 
/tmp/lightdm.log-with_1.32.0-7-after_switch.txt

install 1.33, reboot:
# cp /var/log/lightdm/lightdm.log 
/tmp/lightdm.log-with_1.33.0-1-before_switch.txt
$ dm-tool switch-to-greeter
# cp /var/log/lightdm/lightdm.log 
/tmp/lightdm.log-with_1.33.0-1-after_switch.txt

=> 1.33 says "[+53.94s] DEBUG: Seat seat0: Unable to switch to greeter because 
the seat already has a session and does not support session switching"


[ systemd ]
I use systemd
$ dpkg -l "systemd*"
┌── Desired=Unknown/Install/Remove/Purge/Hold
│┌─ Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
││┌ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
│││ Name                        Version      Architecture Description
├┼┼─═══════════════════════════─════════════─════════════─═════════════════════════════════════>
ii  systemd                     261.2-1      amd64        system and service 
manager
un  systemd-boot                <none>       <none>       (no description 
available)
un  systemd-container           <none>       <none>       (no description 
available)
un  systemd-cron                <none>       <none>       (no description 
available)
ii  systemd-cryptsetup          261.2-1      amd64        Provides cryptsetup, 
integritysetup a>
un  systemd-homed               <none>       <none>       (no description 
available)
un  systemd-imds                <none>       <none>       (no description 
available)
un  systemd-repart              <none>       <none>       (no description 
available)
un  systemd-report              <none>       <none>       (no description 
available)
un  systemd-resolved            <none>       <none>       (no description 
available)
un  systemd-shim                <none>       <none>       (no description 
available)
un  systemd-standalone-sysusers <none>       <none>       (no description 
available)
un  systemd-standalone-tmpfiles <none>       <none>       (no description 
available)
un  systemd-sysusers            <none>       <none>       (no description 
available)
ii  systemd-sysv                261.2-1      amd64        system and service 
manager - SysV com>
ii  systemd-timesyncd           261.2-1      amd64        minimalistic service 
to synchronize l>
un  systemd-tmpfiles            <none>       <none>       (no description 
available)
ii  systemd-tpm                 261.2-1      amd64        Provides tpm2 
utilities and units
ii  systemd-userdbd             261.2-1      amd64        dynamic user/group 
manager



Kind regards,
Franck
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=1616
[+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/01_debian.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/10_fr_changes_lightdm.conf
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local 
(GLocalVfs) for ‘gio-vfs’
[+0.08s] DEBUG: Monitoring logind for seats
[+0.08s] DEBUG: New seat added from logind: seat0
[+0.08s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.08s] DEBUG: Seat seat0 has property CanMultiSession=no
[+0.08s] DEBUG: Seat seat0: Starting
[+0.08s] DEBUG: Seat seat0: Creating greeter session
[+0.08s] DEBUG: Seat seat0: Creating display server of type x
[+0.08s] DEBUG: Could not run plymouth --ping: Failed to execute child process 
“plymouth” (No such file or directory)
[+0.08s] DEBUG: Using VT 7
[+0.08s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.08s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.08s] DEBUG: XServer 0: Writing X server authority to 
/var/run/lightdm/root/:0
[+0.08s] DEBUG: XServer 0: Launching X Server
[+0.08s] DEBUG: Launching process 1679: /usr/bin/X :0 -seat seat0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.08s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+0.08s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.08s] DEBUG: Registering seat with bus path 
/org/freedesktop/DisplayManager/Seat0
[+0.08s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.08s] DEBUG: User /org/freedesktop/Accounts/User1001 added
[+0.11s] DEBUG: User /org/freedesktop/Accounts/User1002 added
[+0.11s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+1.07s] DEBUG: Got signal 10 from process 1679
[+1.07s] DEBUG: XServer 0: Got signal from X server :0
[+1.07s] DEBUG: XServer 0: Connecting to XServer :0
[+1.07s] DEBUG: Seat seat0: Display server ready, starting session 
authentication
[+1.07s] DEBUG: Session pid=1734: Started with service 'lightdm-greeter', 
username 'lightdm'
[+1.09s] DEBUG: Session pid=1734: Authentication complete with return value 0: 
Success
[+1.09s] DEBUG: Seat seat0: Session authenticated, running command
[+1.09s] DEBUG: Session pid=1734: Running command /usr/sbin/lightdm-gtk-greeter
[+1.09s] DEBUG: Creating shared data directory /var/lib/lightdm/data/lightdm
[+1.09s] DEBUG: Session pid=1734: Logging to /var/log/lightdm/seat0-greeter.log
[+1.42s] DEBUG: Activating VT 7
[+1.42s] DEBUG: Activating login1 session c1
[+1.42s] DEBUG: Seat seat0 changes active session to c1
[+1.42s] DEBUG: Session c1 is already active
[+1.42s] DEBUG: Seat seat0 changes active session to c1
[+1.42s] DEBUG: Session c1 is already active
[+1.62s] DEBUG: Greeter connected version=1.32.0 api=1 resettable=false
[+2.01s] DEBUG: Greeter start authentication for f
[+2.01s] DEBUG: Session pid=1914: Started with service 'lightdm', username 'f'
[+2.04s] DEBUG: Session pid=1914: Got 1 message(s) from PAM
[+2.04s] DEBUG: Prompt greeter with 1 message(s)
[+5.08s] DEBUG: Continue authentication
[+5.12s] DEBUG: Session pid=1914: Authentication complete with return value 0: 
Success
[+5.12s] DEBUG: Authenticate result for user f: Success
[+5.12s] DEBUG: User f authorized
[+5.14s] DEBUG: Greeter requests session lightdm-xsession
[+5.14s] DEBUG: Seat seat0: Stopping greeter; display server will be re-used 
for user session
[+5.14s] DEBUG: Terminating login1 session c1
[+5.15s] DEBUG: Session pid=1734: Sending SIGTERM
[+5.18s] DEBUG: Greeter closed communication channel
[+5.18s] DEBUG: Session pid=1734: Exited with return value 0
[+5.18s] DEBUG: Seat seat0: Session stopped
[+5.18s] DEBUG: Seat seat0: Greeter stopped, running session
[+5.18s] DEBUG: Registering session with bus path 
/org/freedesktop/DisplayManager/Session0
[+5.18s] DEBUG: Session pid=1914: Running command /etc/X11/Xsession default
[+5.18s] DEBUG: Creating shared data directory /var/lib/lightdm/data/f
[+5.18s] DEBUG: Session pid=1914: Logging to .xsession-errors
[+5.49s] DEBUG: Activating VT 7
[+5.49s] DEBUG: Activating login1 session 2
[+5.49s] DEBUG: Seat seat0 changes active session to 2
[+5.49s] DEBUG: Session 2 is already active
[+5.49s] DEBUG: Seat seat0 changes active session to 2
[+5.49s] DEBUG: Session 2 is already active
[+156.72s] DEBUG: Seat seat0: Creating greeter session
[+156.72s] DEBUG: Seat seat0: Creating display server of type x
[+156.72s] DEBUG: Using VT 8
[+156.72s] DEBUG: Seat seat0: Starting local X display on VT 8
[+156.72s] DEBUG: XServer 1: Logging to /var/log/lightdm/x-1.log
[+156.72s] DEBUG: XServer 1: Writing X server authority to 
/var/run/lightdm/root/:1
[+156.72s] DEBUG: XServer 1: Launching X Server
[+156.72s] DEBUG: Launching process 3995: /usr/bin/X :1 -seat seat0 -auth 
/var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
[+156.72s] DEBUG: XServer 1: Waiting for ready signal from X server :1
[+157.32s] DEBUG: Seat seat0 changes active session to 
[+158.17s] DEBUG: Got signal 10 from process 3995
[+158.17s] DEBUG: XServer 1: Got signal from X server :1
[+158.17s] DEBUG: XServer 1: Connecting to XServer :1
[+158.17s] DEBUG: Seat seat0: Display server ready, starting session 
authentication
[+158.17s] DEBUG: Session pid=4039: Started with service 'lightdm-greeter', 
username 'lightdm'
[+158.18s] DEBUG: Session pid=4039: Authentication complete with return value 
0: Success
[+158.18s] DEBUG: Seat seat0: Session authenticated, running command
[+158.18s] DEBUG: Session pid=4039: Running command 
/usr/sbin/lightdm-gtk-greeter
[+158.18s] DEBUG: Creating shared data directory /var/lib/lightdm/data/lightdm
[+158.18s] DEBUG: Session pid=4039: Logging to 
/var/log/lightdm/seat0-greeter.log
[+158.41s] DEBUG: Activating VT 8
[+158.41s] DEBUG: Locking login1 session 2
[+158.41s] DEBUG: Activating login1 session c2
[+158.41s] DEBUG: Seat seat0 changes active session to c2
[+158.41s] DEBUG: Session c2 is already active
[+158.41s] DEBUG: Seat seat0 changes active session to c2
[+158.41s] DEBUG: Session c2 is already active
[+158.58s] DEBUG: Greeter connected version=1.32.0 api=1 resettable=false
[+159.00s] DEBUG: Greeter start authentication for f
[+159.01s] DEBUG: Session pid=4218: Started with service 'lightdm', username 'f'
[+159.06s] DEBUG: Session pid=4218: Got 1 message(s) from PAM
[+159.06s] DEBUG: Prompt greeter with 1 message(s)
[+163.88s] DEBUG: Continue authentication
[+163.95s] DEBUG: Session pid=4218: Authentication complete with return value 
0: Success
[+163.95s] DEBUG: Authenticate result for user f: Success
[+163.95s] DEBUG: User f authorized
[+163.99s] DEBUG: Greeter requests session lightdm-xsession
[+163.99s] DEBUG: Seat seat0: Returning to existing user session f
[+163.99s] DEBUG: Unlocking login1 session 2
[+163.99s] DEBUG: Activating VT 7
[+164.13s] DEBUG: Seat seat0: Stopping greeter
[+164.13s] DEBUG: Terminating login1 session c2
[+164.16s] DEBUG: Session pid=4039: Sending SIGTERM
[+164.16s] DEBUG: Activating login1 session 2
[+164.17s] DEBUG: Session pid=4218: Exited with return value 0
[+164.17s] DEBUG: Seat seat0: Session stopped
[+164.20s] DEBUG: Seat seat0 changes active session to 2
[+164.20s] DEBUG: Session 2 is already active
[+164.21s] DEBUG: Greeter closed communication channel
[+164.21s] DEBUG: Session pid=4039: Exited with return value 0
[+164.21s] DEBUG: Seat seat0: Session stopped
[+164.21s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+164.21s] DEBUG: Sending signal 15 to process 3995
[+164.23s] DEBUG: Process 3995 exited with return value 0
[+164.23s] DEBUG: XServer 1: X server stopped
[+164.23s] DEBUG: Releasing VT 8
[+164.23s] DEBUG: XServer 1: Removing X server authority 
/var/run/lightdm/root/:1
[+164.23s] DEBUG: Seat seat0: Display server stopped
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=1616
[+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/01_debian.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/10_fr_changes_lightdm.conf
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local 
(GLocalVfs) for ‘gio-vfs’
[+0.08s] DEBUG: Monitoring logind for seats
[+0.08s] DEBUG: New seat added from logind: seat0
[+0.08s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.08s] DEBUG: Seat seat0 has property CanMultiSession=no
[+0.08s] DEBUG: Seat seat0: Starting
[+0.08s] DEBUG: Seat seat0: Creating greeter session
[+0.08s] DEBUG: Seat seat0: Creating display server of type x
[+0.08s] DEBUG: Could not run plymouth --ping: Failed to execute child process 
“plymouth” (No such file or directory)
[+0.08s] DEBUG: Using VT 7
[+0.08s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.08s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.08s] DEBUG: XServer 0: Writing X server authority to 
/var/run/lightdm/root/:0
[+0.08s] DEBUG: XServer 0: Launching X Server
[+0.08s] DEBUG: Launching process 1679: /usr/bin/X :0 -seat seat0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.08s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+0.08s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.08s] DEBUG: Registering seat with bus path 
/org/freedesktop/DisplayManager/Seat0
[+0.08s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.08s] DEBUG: User /org/freedesktop/Accounts/User1001 added
[+0.11s] DEBUG: User /org/freedesktop/Accounts/User1002 added
[+0.11s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+1.07s] DEBUG: Got signal 10 from process 1679
[+1.07s] DEBUG: XServer 0: Got signal from X server :0
[+1.07s] DEBUG: XServer 0: Connecting to XServer :0
[+1.07s] DEBUG: Seat seat0: Display server ready, starting session 
authentication
[+1.07s] DEBUG: Session pid=1734: Started with service 'lightdm-greeter', 
username 'lightdm'
[+1.09s] DEBUG: Session pid=1734: Authentication complete with return value 0: 
Success
[+1.09s] DEBUG: Seat seat0: Session authenticated, running command
[+1.09s] DEBUG: Session pid=1734: Running command /usr/sbin/lightdm-gtk-greeter
[+1.09s] DEBUG: Creating shared data directory /var/lib/lightdm/data/lightdm
[+1.09s] DEBUG: Session pid=1734: Logging to /var/log/lightdm/seat0-greeter.log
[+1.42s] DEBUG: Activating VT 7
[+1.42s] DEBUG: Activating login1 session c1
[+1.42s] DEBUG: Seat seat0 changes active session to c1
[+1.42s] DEBUG: Session c1 is already active
[+1.42s] DEBUG: Seat seat0 changes active session to c1
[+1.42s] DEBUG: Session c1 is already active
[+1.62s] DEBUG: Greeter connected version=1.32.0 api=1 resettable=false
[+2.01s] DEBUG: Greeter start authentication for f
[+2.01s] DEBUG: Session pid=1914: Started with service 'lightdm', username 'f'
[+2.04s] DEBUG: Session pid=1914: Got 1 message(s) from PAM
[+2.04s] DEBUG: Prompt greeter with 1 message(s)
[+5.08s] DEBUG: Continue authentication
[+5.12s] DEBUG: Session pid=1914: Authentication complete with return value 0: 
Success
[+5.12s] DEBUG: Authenticate result for user f: Success
[+5.12s] DEBUG: User f authorized
[+5.14s] DEBUG: Greeter requests session lightdm-xsession
[+5.14s] DEBUG: Seat seat0: Stopping greeter; display server will be re-used 
for user session
[+5.14s] DEBUG: Terminating login1 session c1
[+5.15s] DEBUG: Session pid=1734: Sending SIGTERM
[+5.18s] DEBUG: Greeter closed communication channel
[+5.18s] DEBUG: Session pid=1734: Exited with return value 0
[+5.18s] DEBUG: Seat seat0: Session stopped
[+5.18s] DEBUG: Seat seat0: Greeter stopped, running session
[+5.18s] DEBUG: Registering session with bus path 
/org/freedesktop/DisplayManager/Session0
[+5.18s] DEBUG: Session pid=1914: Running command /etc/X11/Xsession default
[+5.18s] DEBUG: Creating shared data directory /var/lib/lightdm/data/f
[+5.18s] DEBUG: Session pid=1914: Logging to .xsession-errors
[+5.49s] DEBUG: Activating VT 7
[+5.49s] DEBUG: Activating login1 session 2
[+5.49s] DEBUG: Seat seat0 changes active session to 2
[+5.49s] DEBUG: Session 2 is already active
[+5.49s] DEBUG: Seat seat0 changes active session to 2
[+5.49s] DEBUG: Session 2 is already active
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.33.0, UID=0 PID=1617
[+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/01_debian.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/10_fr_changes_lightdm.conf
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local 
(GLocalVfs) for ‘gio-vfs’
[+0.02s] DEBUG: Monitoring logind for seats
[+0.02s] DEBUG: New seat added from logind: seat0
[+0.02s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.02s] DEBUG: Seat seat0 has property CanMultiSession=no
[+0.02s] DEBUG: Seat seat0: Starting
[+0.02s] DEBUG: Seat seat0: Creating greeter session
[+0.02s] DEBUG: Seat seat0: Creating display server of type x
[+0.03s] DEBUG: Could not run plymouth --ping: Failed to execute child process 
“plymouth” (No such file or directory)
[+0.03s] DEBUG: Using VT 7
[+0.03s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.03s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.03s] DEBUG: XServer 0: Writing X server authority to 
/var/run/lightdm/root/:0
[+0.03s] DEBUG: XServer 0: Launching X Server
[+0.03s] DEBUG: Launching process 1673: /usr/bin/X :0 -seat seat0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.03s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+0.03s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.03s] DEBUG: Registering seat with bus path 
/org/freedesktop/DisplayManager/Seat0
[+0.03s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.03s] DEBUG: User /org/freedesktop/Accounts/User1001 added
[+0.08s] DEBUG: User /org/freedesktop/Accounts/User1002 added
[+0.08s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+0.92s] DEBUG: Got signal 10 from process 1673
[+0.92s] DEBUG: XServer 0: Got signal from X server :0
[+0.92s] DEBUG: XServer 0: Connecting to XServer :0
[+0.92s] DEBUG: Seat seat0: Display server ready, starting session 
authentication
[+0.92s] DEBUG: Session pid=1734: Started with service 'lightdm-greeter', 
username 'lightdm'
[+0.96s] DEBUG: Session pid=1734: Authentication complete with return value 0: 
Success
[+0.96s] DEBUG: Seat seat0: Session authenticated, running command
[+0.96s] DEBUG: Session pid=1734: Running command /usr/sbin/lightdm-gtk-greeter
[+0.96s] DEBUG: Creating shared data directory /var/lib/lightdm/data/lightdm
[+0.96s] DEBUG: Session pid=1734: Logging to /var/log/lightdm/seat0-greeter.log
[+1.35s] DEBUG: Activating VT 7
[+1.35s] DEBUG: Activating login1 session c1
[+1.35s] DEBUG: Seat seat0 changes active session to c1
[+1.35s] DEBUG: Session c1 is already active
[+1.35s] DEBUG: Seat seat0 changes active session to c1
[+1.35s] DEBUG: Session c1 is already active
[+1.54s] DEBUG: Greeter connected version=1.33.0 api=1 resettable=false
[+1.99s] DEBUG: Greeter start authentication for f
[+1.99s] DEBUG: Session pid=1914: Started with service 'lightdm', username 'f'
[+2.04s] DEBUG: Session pid=1914: Got 1 message(s) from PAM
[+2.04s] DEBUG: Prompt greeter with 1 message(s)
[+5.02s] DEBUG: Continue authentication
[+5.06s] DEBUG: Session pid=1914: Authentication complete with return value 0: 
Success
[+5.06s] DEBUG: Authenticate result for user f: Success
[+5.06s] DEBUG: User f authorized
[+5.09s] DEBUG: Greeter requests session lightdm-xsession
[+5.09s] DEBUG: Seat seat0: Stopping greeter; display server will be re-used 
for user session
[+5.09s] DEBUG: Terminating login1 session c1
[+5.09s] DEBUG: Session pid=1734: Sending SIGTERM
[+5.10s] DEBUG: Greeter closed communication channel
[+5.10s] DEBUG: Session pid=1734: Exited with return value 0
[+5.10s] DEBUG: Seat seat0: Session stopped
[+5.10s] DEBUG: Seat seat0: Greeter stopped, running session
[+5.10s] DEBUG: Registering session with bus path 
/org/freedesktop/DisplayManager/Session0
[+5.10s] DEBUG: Session pid=1914: Running command /etc/X11/Xsession default
[+5.10s] DEBUG: Creating shared data directory /var/lib/lightdm/data/f
[+5.10s] DEBUG: Session pid=1914: Logging to .xsession-errors
[+5.38s] DEBUG: Activating VT 7
[+5.38s] DEBUG: Activating login1 session 2
[+5.38s] DEBUG: Seat seat0 changes active session to 2
[+5.38s] DEBUG: Session 2 is already active
[+5.38s] DEBUG: Seat seat0 changes active session to 2
[+5.38s] DEBUG: Session 2 is already active
[+53.94s] DEBUG: Seat seat0: Unable to switch to greeter because the seat 
already has a session and does not support session switching
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.33.0, UID=0 PID=1617
[+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/01_debian.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/10_fr_changes_lightdm.conf
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local 
(GLocalVfs) for ‘gio-vfs’
[+0.02s] DEBUG: Monitoring logind for seats
[+0.02s] DEBUG: New seat added from logind: seat0
[+0.02s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.02s] DEBUG: Seat seat0 has property CanMultiSession=no
[+0.02s] DEBUG: Seat seat0: Starting
[+0.02s] DEBUG: Seat seat0: Creating greeter session
[+0.02s] DEBUG: Seat seat0: Creating display server of type x
[+0.03s] DEBUG: Could not run plymouth --ping: Failed to execute child process 
“plymouth” (No such file or directory)
[+0.03s] DEBUG: Using VT 7
[+0.03s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.03s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.03s] DEBUG: XServer 0: Writing X server authority to 
/var/run/lightdm/root/:0
[+0.03s] DEBUG: XServer 0: Launching X Server
[+0.03s] DEBUG: Launching process 1673: /usr/bin/X :0 -seat seat0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.03s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+0.03s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.03s] DEBUG: Registering seat with bus path 
/org/freedesktop/DisplayManager/Seat0
[+0.03s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.03s] DEBUG: User /org/freedesktop/Accounts/User1001 added
[+0.08s] DEBUG: User /org/freedesktop/Accounts/User1002 added
[+0.08s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+0.92s] DEBUG: Got signal 10 from process 1673
[+0.92s] DEBUG: XServer 0: Got signal from X server :0
[+0.92s] DEBUG: XServer 0: Connecting to XServer :0
[+0.92s] DEBUG: Seat seat0: Display server ready, starting session 
authentication
[+0.92s] DEBUG: Session pid=1734: Started with service 'lightdm-greeter', 
username 'lightdm'
[+0.96s] DEBUG: Session pid=1734: Authentication complete with return value 0: 
Success
[+0.96s] DEBUG: Seat seat0: Session authenticated, running command
[+0.96s] DEBUG: Session pid=1734: Running command /usr/sbin/lightdm-gtk-greeter
[+0.96s] DEBUG: Creating shared data directory /var/lib/lightdm/data/lightdm
[+0.96s] DEBUG: Session pid=1734: Logging to /var/log/lightdm/seat0-greeter.log
[+1.35s] DEBUG: Activating VT 7
[+1.35s] DEBUG: Activating login1 session c1
[+1.35s] DEBUG: Seat seat0 changes active session to c1
[+1.35s] DEBUG: Session c1 is already active
[+1.35s] DEBUG: Seat seat0 changes active session to c1
[+1.35s] DEBUG: Session c1 is already active
[+1.54s] DEBUG: Greeter connected version=1.33.0 api=1 resettable=false
[+1.99s] DEBUG: Greeter start authentication for f
[+1.99s] DEBUG: Session pid=1914: Started with service 'lightdm', username 'f'
[+2.04s] DEBUG: Session pid=1914: Got 1 message(s) from PAM
[+2.04s] DEBUG: Prompt greeter with 1 message(s)
[+5.02s] DEBUG: Continue authentication
[+5.06s] DEBUG: Session pid=1914: Authentication complete with return value 0: 
Success
[+5.06s] DEBUG: Authenticate result for user f: Success
[+5.06s] DEBUG: User f authorized
[+5.09s] DEBUG: Greeter requests session lightdm-xsession
[+5.09s] DEBUG: Seat seat0: Stopping greeter; display server will be re-used 
for user session
[+5.09s] DEBUG: Terminating login1 session c1
[+5.09s] DEBUG: Session pid=1734: Sending SIGTERM
[+5.10s] DEBUG: Greeter closed communication channel
[+5.10s] DEBUG: Session pid=1734: Exited with return value 0
[+5.10s] DEBUG: Seat seat0: Session stopped
[+5.10s] DEBUG: Seat seat0: Greeter stopped, running session
[+5.10s] DEBUG: Registering session with bus path 
/org/freedesktop/DisplayManager/Session0
[+5.10s] DEBUG: Session pid=1914: Running command /etc/X11/Xsession default
[+5.10s] DEBUG: Creating shared data directory /var/lib/lightdm/data/f
[+5.10s] DEBUG: Session pid=1914: Logging to .xsession-errors
[+5.38s] DEBUG: Activating VT 7
[+5.38s] DEBUG: Activating login1 session 2
[+5.38s] DEBUG: Seat seat0 changes active session to 2
[+5.38s] DEBUG: Session 2 is already active
[+5.38s] DEBUG: Seat seat0 changes active session to 2
[+5.38s] DEBUG: Session 2 is already active

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