[SOLVED]lightdm won't start, miising username "lighdm-gtk-greeter"

tombenko · 2022-12-22 14:30:03

Hail!
I installed lightdm with

# pacman -S lightdm lightdm-gtk-greeter lightdm-gtk-greeter-settings

edited the ```/etc/lightdm/lightdm.conf``` file, and enabled the service. It fails to load, because missing lightdm-gtk-greeter user.

The conf file:

#
# General configuration
#
# start-default-seat = True to always start one seat if none are defined in the configuration
# greeter-user = User to run greeter as
# minimum-display-number = Minimum display number to use for X servers
# minimum-vt = First VT to run displays on
# lock-memory = True to prevent memory from being paged to disk
# user-authority-in-system-dir = True if session authority should be in the system location
# guest-account-script = Script to be run to setup guest account
# logind-check-graphical = True to on start seats that are marked as graphical by logind
# log-directory = Directory to log information to
# run-directory = Directory to put running state in
# cache-directory = Directory to cache to
# sessions-directory = Directory to find sessions
# remote-sessions-directory = Directory to find remote sessions
# greeters-directory = Directory to find greeters
# backup-logs = True to move add a .old suffix to old log files when opening new ones
# dbus-service = True if LightDM provides a D-Bus service to control it
#
[LightDM]
#start-default-seat=true
greeter-user=lightdm-gtk-greeter
#minimum-display-number=0
#minimum-vt=7 # Setting this to a value < 7 implies security issues, see FS#46799
#lock-memory=true
#user-authority-in-system-dir=false
#guest-account-script=guest-account
logind-check-graphical=true
log-directory=/var/log/lightdm
run-directory=/run/lightdm
cache-directory=/var/cache/lightdm
#sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions:/usr/share/wayland-sessions
#remote-sessions-directory=/usr/share/lightdm/remote-sessions
#greeters-directory=$XDG_DATA_DIRS/lightdm/greeters:$XDG_DATA_DIRS/xgreeters
#backup-logs=true
#dbus-service=true

#
# Seat configuration
#
# Seat configuration is matched against the seat name glob in the section, for example:
# [Seat:*] matches all seats and is applied first.
# [Seat:seat0] matches the seat named "seat0".
# [Seat:seat-thin-client*] matches all seats that have names that start with "seat-thin-client".
#
# type = Seat type (local, xremote)
# pam-service = PAM service to use for login
# pam-autologin-service = PAM service to use for autologin
# pam-greeter-service = PAM service to use for greeters
# xserver-command = X server command to run (can also contain arguments e.g. X -special-option)
# xmir-command = Xmir server command to run (can also contain arguments e.g. Xmir -special-option)
# xserver-config = Config file to pass to X server
# xserver-layout = Layout to pass to X server
# xserver-allow-tcp = True if TCP/IP connections are allowed to this X server
# xserver-share = True if the X server is shared for both greeter and session
# xserver-hostname = Hostname of X server (only for type=xremote)
# xserver-display-number = Display number of X server (only for type=xremote)
# xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true)
# xdmcp-port = XDMCP UDP/IP port to communicate on
# xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in keys.conf)
# greeter-session = Session to load for greeter
# greeter-hide-users = True to hide the user list
# greeter-allow-guest = True if the greeter should show a guest login option
# greeter-show-manual-login = True if the greeter should offer a manual login option
# greeter-show-remote-login = True if the greeter should offer a remote login option
# user-session = Session to load for users
# allow-user-switching = True if allowed to switch users
# allow-guest = True if guest login is allowed
# guest-session = Session to load for guests (overrides user-session)
# session-wrapper = Wrapper script to run session with
# greeter-wrapper = Wrapper script to run greeter with
# guest-wrapper = Wrapper script to run guest sessions with
# display-setup-script = Script to run when starting a greeter session (runs as root)
# display-stopped-script = Script to run after stopping the display server (runs as root)
# greeter-setup-script = Script to run when starting a greeter (runs as root)
# session-setup-script = Script to run when starting a user session (runs as root)
# session-cleanup-script = Script to run when quitting a user session (runs as root)
# autologin-guest = True to log in as guest by default
# autologin-user = User to log in with by default (overrides autologin-guest)
# autologin-user-timeout = Number of seconds to wait before loading default user
# autologin-session = Session to load for automatic login (overrides user-session)
# autologin-in-background = True if autologin session should not be immediately activated
# exit-on-failure = True if the daemon should exit if this seat fails
#
[Seat:*]
type=local
pam-service=lightdm
#pam-autologin-service=lightdm-autologin
pam-greeter-service=lightdm-gtk-greeter
#xserver-command=X
#xmir-command=Xmir
#xserver-config=
#xserver-layout=
#xserver-allow-tcp=false
#xserver-share=true
#xserver-hostname=
#xserver-display-number=
#xdmcp-manager=
#xdmcp-port=177
#xdmcp-key=
greeter-session=lightdm-gtk-greeter
#greeter-hide-users=false
#greeter-allow-guest=true
#greeter-show-manual-login=false
#greeter-show-remote-login=true
#user-session=default
#allow-user-switching=true
#allow-guest=true
#guest-session=
session-wrapper=/etc/lightdm/Xsession
#greeter-wrapper=
#guest-wrapper=
#display-setup-script=
#display-stopped-script=
#greeter-setup-script=
#session-setup-script=
#session-cleanup-script=
#autologin-guest=false
#autologin-user=
#autologin-user-timeout=0
#autologin-in-background=false
#autologin-session=
#exit-on-failure=false

#
# XDMCP Server configuration
#
# enabled = True if XDMCP connections should be allowed
# port = UDP/IP port to listen for connections on
# listen-address = Host/address to listen for XDMCP connections (use all addresses if not present)
# key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to not use authentication (stored in keys.conf)
# hostname = Hostname to report to XDMCP clients (defaults to system hostname if unset)
#
# The authentication key is a 56 bit DES key specified in hex as 0xnnnnnnnnnnnnnn.  Alternatively
# it can be a word and the first 7 characters are used as the key.
#
[XDMCPServer]
#enabled=false
#port=177
#listen-address=
#key=
#hostname=

#
# VNC Server configuration
#
# enabled = True if VNC connections should be allowed
# command = Command to run Xvnc server with
# port = TCP/IP port to listen for connections on
# listen-address = Host/address to listen for VNC connections (use all addresses if not present)
# width = Width of display to use
# height = Height of display to use
# depth = Color depth of display to use
#
[VNCServer]
#enabled=false
#command=Xvnc
#port=5900
#listen-address=
#width=1024
#height=768
#depth=8

The log file:

[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=6845
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
[+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
[+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: Using cross-namespace EXTERNAL authentication (this will deadlock if server is GDBus < 2.73.3)
[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local (GLocalVfs) for ‘gio-vfs’
[+0.00s] DEBUG: Monitoring logind for seats
[+0.00s] DEBUG: New seat added from logind: seat0
[+0.00s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.00s] DEBUG: Seat seat0 has property CanMultiSession=no
[+0.00s] DEBUG: Seat seat0: Starting
[+0.00s] DEBUG: Seat seat0: Creating greeter session
[+0.00s] DEBUG: Seat seat0: Creating display server of type x
[+0.01s] DEBUG: Could not run plymouth --ping: Failed to execute child process “plymouth” (No such file or directory)
[+0.01s] DEBUG: Using VT 7
[+0.01s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.01s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.01s] DEBUG: XServer 0: Writing X server authority to /run/lightdm/root/:0
[+0.01s] DEBUG: XServer 0: Launching X Server
[+0.01s] DEBUG: Launching process 6850: /usr/bin/X :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.01s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.01s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.01s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.01s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+0.64s] DEBUG: Got signal 10 from process 6850
[+0.64s] DEBUG: XServer 0: Got signal from X server :0
[+0.64s] DEBUG: XServer 0: Connecting to XServer :0
[+0.73s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+0.73s] DEBUG: Session pid=6859: Started with service 'lightdm-gtk-greeter', username 'lightdm-gtk-greeter'
[+0.74s] DEBUG: Session pid=6859: Authentication complete with return value 10: User not known to the underlying authentication module
[+0.74s] DEBUG: Seat seat0: Stopping session that failed authentication
[+0.74s] DEBUG: Session pid=6859: Sending SIGTERM
[+0.74s] DEBUG: Greeter closed communication channel
[+0.74s] DEBUG: Session pid=6859: Terminated with signal 15
[+0.74s] DEBUG: Seat seat0: Session stopped
[+0.74s] DEBUG: Seat seat0: Stopping; failed to start a greeter
[+0.74s] DEBUG: Seat seat0: Stopping
[+0.74s] DEBUG: Seat seat0: Stopping display server
[+0.74s] DEBUG: Sending signal 15 to process 6850
[+1.11s] DEBUG: Process 6850 exited with return value 0
[+1.11s] DEBUG: XServer 0: X server stopped
[+1.11s] DEBUG: Releasing VT 7
[+1.11s] DEBUG: XServer 0: Removing X server authority /run/lightdm/root/:0
[+1.11s] DEBUG: Seat seat0: Display server stopped
[+1.11s] DEBUG: Seat seat0: Stopped
[+1.11s] DEBUG: Required seat has stopped
[+1.11s] DEBUG: Stopping display manager
[+1.11s] DEBUG: Display manager stopped
[+1.11s] DEBUG: Stopping daemon
[+1.11s] DEBUG: Exiting with return value 1

Last edited by tombenko (2022-12-22 20:10:06)

Trilby · 2022-12-22 14:37:18

Yeah, and? The error is pretty clear - I highly doubt there is a user on your system named "lightdm-gtk-greeter", is there? I think lightdm creates a user named "lightdm", and I suspect this would be the default without uncommenting and changing that line of the config, but unless you created another user named lightdm-gtk-greeter, then the error makes sense.

tombenko · 2022-12-22 14:57:01

On the other machine there is no need of any user created, lightdm just starts.

Trilby · 2022-12-22 15:06:59

And on this other machine I suspect you did not edit the config file in the same way. There should be no need to create any user if you use the default config. But if you explicitly tell lightdm to use a given user name, that user name must exist.

Last edited by Trilby (2022-12-22 15:07:25)

tombenko · 2022-12-22 15:15:30

Mostly the same way. But you were true: when I set up the greeter, messed the greeter-user and greeter-session lines. Now everything is alright. Me too. Thanks!

Arch Linux

#1 2022-12-22 14:30:03

[SOLVED]lightdm won't start, miising username "lighdm-gtk-greeter"

#2 2022-12-22 14:37:18

Re: [SOLVED]lightdm won't start, miising username "lighdm-gtk-greeter"

#3 2022-12-22 14:57:01

Re: [SOLVED]lightdm won't start, miising username "lighdm-gtk-greeter"

#4 2022-12-22 15:06:59

Re: [SOLVED]lightdm won't start, miising username "lighdm-gtk-greeter"

#5 2022-12-22 15:15:30

Re: [SOLVED]lightdm won't start, miising username "lighdm-gtk-greeter"

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