lightdm display manager debug shows error
How fix the display manager error from lightdm debug, -d option:
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
# groupadd -r autologin
# usermod -a -G autologin $USER
Please a useful hint is worthwhile