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lightdm display manager debug shows error

How fix the display manager error from lightdm debug, -d option:

Code: [Select]
     1	[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
     2	[+0.00s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=2245
     3	[+0.01s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
     4	[+0.01s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
     5	[+0.01s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
     6	[+0.01s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
     7	[+0.02s] DEBUG: Registered seat module local
     8	[+0.02s] DEBUG: Registered seat module xremote
     9	[+0.02s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
    10[+0.03s] DEBUG: _g_io_module_get_default: Found default implementation local (GLocalVfs) for ‘gio-vfs’
    11[+0.03s] DEBUG: Using cross-namespace EXTERNAL authentication (this will deadlock if server is GDBus < 2.73.3)
    12[+0.04s] DEBUG: Monitoring logind for seats
    13[+0.04s] DEBUG: New seat added from logind: seat0
    14[+0.04s] DEBUG: Seat seat0: Loading properties from config section Seat:*
    15[+0.04s] DEBUG: Seat seat0 has property CanMultiSession=no
    16[+0.05s] DEBUG: Seat seat0: Starting
    17[+0.05s] DEBUG: Seat seat0: Creating user session
    18[+0.05s] DEBUG: Loading users from org.freedesktop.Accounts
    19[+0.06s] DEBUG: User /org/freedesktop/Accounts/User1000 added

    20	[+0.07s] DEBUG: Seat seat0: Failed to find session configuration default
    21	[+0.07s] DEBUG: Seat seat0: Can't find session 'default'
    22	[+0.07s] DEBUG: Seat seat0: Creating greeter session
    23	[+0.08s] DEBUG: Seat seat0: Failed to find session configuration lightdm-gtk-greeter
    24	[+0.08s] DEBUG: Seat seat0: Failed to create greeter session
    25	[+0.08s] DEBUG: Failed to start seat: seat0
extra line space to point start of error, while already did
Code: [Select]
# groupadd -r autologin
# usermod -a -G autologin $USER

Please a useful hint is worthwhile

Re: lightdm display manager debug shows error

Reply #2 –
installed
Imho every required was, now install some more has lightdm log :
    1   [+0.01s] DEBUG: Logging to /var/log/lightdm/lightdm.log
     2   [+0.01s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=1857
     3   [+0.01s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
     4   [+0.01s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
     5   [+0.01s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
     6   [+0.01s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
     7   [+0.01s] DEBUG: Registered seat module local
     8   [+0.01s] DEBUG: Registered seat module xremote
     9   [+0.01s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
    10   [+0.02s] DEBUG: Using cross-namespace EXTERNAL authentication (this will deadlock if server is GDBus < 2.73.3)
    11   [+0.02s] DEBUG: _g_io_module_get_default: Found default implementation local (GLocalVfs) for ‘gio-vfs’
    12   [+0.02s] DEBUG: Monitoring logind for seats
    13   [+0.02s] DEBUG: New seat added from logind: seat0
    14   [+0.02s] DEBUG: Seat seat0: Loading properties from config section Seat:*
    15   [+0.02s] DEBUG: Seat seat0 has property CanMultiSession=no
    16   [+0.02s] DEBUG: Seat seat0: Starting
    17   [+0.02s] DEBUG: Seat seat0: Creating user session
    18   [+0.02s] WARNING: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files
    19   [+0.02s] DEBUG: Loading user config from /etc/lightdm/users.conf
    20   [+0.09s] DEBUG: User budi added
    21   [+0.14s] DEBUG: Seat seat0: Creating display server of type x
    22   [+0.14s] DEBUG: Could not run plymouth --ping: Failed to execute child process “plymouth” (No such file or directory)
    23   [+0.14s] DEBUG: Using VT 7
    24   [+0.14s] DEBUG: Seat seat0: Starting local X display on VT 7
    25   [+0.14s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
    26   [+0.14s] DEBUG: XServer 0: Writing X server authority to /run/lightdm/root/:0
    27   [+0.14s] DEBUG: XServer 0: Launching X Server
    28   [+0.14s] DEBUG: Launching process 1943: /bin/X :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
    29   [+0.14s] DEBUG: XServer 0: Waiting for ready signal from X server :0
    30   [+0.14s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
    31   [+0.14s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
    32   [+3.08s] DEBUG: Got signal 10 from process 1943
    33   [+3.08s] DEBUG: XServer 0: Got signal from X server :0
    34   [+3.08s] DEBUG: XServer 0: Connecting to XServer :0
    35   [+3.68s] DEBUG: Seat seat0: Display server ready, starting session authentication
    36   [+3.68s] DEBUG: Session pid=2075: Started with service 'lightdm-autologin', username 'budi'
    37   [+3.76s] DEBUG: Session pid=2075: Authentication complete with return value 0: Success
    38   [+3.76s] DEBUG: Seat seat0: Session authenticated, running command
    39   [+3.76s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session0
    40   [+3.77s] DEBUG: Session pid=2075: Running command /etc/lightdm/Xsession startxfce4
    41   [+3.77s] DEBUG: Creating shared data directory /var/lib/lightdm-data/budi
    42   [+3.77s] DEBUG: Session pid=2075: Logging to .xsession-errors
    43   [+3.79s] DEBUG: Activating VT 7
    44   [+3.79s] DEBUG: Activating login1 session 1
    45   [+3.79s] DEBUG: Seat seat0 changes active session to 1
    46   [+3.79s] DEBUG: Session 1 is already active
    47   [+4.01s] DEBUG: Session pid=2075: Exited with return value 127
    48   [+4.01s] DEBUG: Seat seat0: Session stopped


look forward a missing package/setting to solve