Lightdm user session settings on Ubuntu
22,438
Solution 1
The better fix (probably) is to ensure that
/etc/X11/Xsession
is executable. This was it for me, and it would match your problem description.
Source: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=748944#27
Solution 2
Solution found
Found a solution rather randomly (~/.xsession pointed me to the xfce session start script called "startxfce4").
In lightdm.conf, I had to set user-session=/usr/bin/startxfce4 and the problem is solved.
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![[LightDM] Use autologin](https://i.ytimg.com/vi/y9M2DQ0heCk/hq720.jpg?sqp=-oaymwEcCNAFEJQDSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLDDadlcykB0KM5C833ZuN6_xRFClQ)
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[LightDM] Use autologin
Author by
Admin
Updated on September 18, 2022Comments
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Admin over 1 year
Lightdm is displayed properly but after entering a password and clicking login, I see the screen blink and lightdm window re-appears and asks to log in as if nothing happened.
Configs
user@laptop:~$ cat /etc/lightdm/
lightdm.conf lightdm-gtk-greeter-ubuntu.conf lightdm-gtk-greeter.conf users.conflightdm.conf
user@laptop:~$ cat /etc/lightdm/lightdm.conf
#[LightDM] #xsessions-directory=/usr/share/xsessions [SeatDefaults] user-session=xfce greeter-session=lightdm-gtk-greeter greeter-hide-users=truelightdm-gtk-greeter.conf
user@laptop:~$ cat /etc/lightdm/lightdm-gtk-greeter.conf
# # background = Background file to use, either an image path or a color (e.g. #772953) # theme-name = GTK+ theme to use # font-name = Font to use # xft-antialias = Whether to antialias Xft fonts (true or false) # xft-dpi = Resolution for Xft in dots per inch (e.g. 96) # xft-hintstyle = What degree of hinting to use (hintnone, hintslight, hintmedium, or hintfull) # xft-rgba = Type of subpixel antialiasing (none, rgb, bgr, vrgb or vbgr) # [greeter] logo=/usr/share/pixmaps/xubuntu-logo-menu.png background=/usr/share/xfce4/backdrops/xubuntu-karmic.png #show-language-selector=false theme-name=retro1 font-name=Droid Sans 10 xft-antialias=true #xft-dpi= xft-hintstyle=hintfull xft-rgba=rgb show-language-selector=truelightdm-gtk-greeter-ubuntu.conf
user@laptop:~$ cat /etc/lightdm/lightdm-gtk-greeter-ubuntu.conf
# # background = Background file to use, either an image path or a color (e.g. #772953) # theme-name = GTK+ theme to use # font-name = Font to use # xft-antialias = Whether to antialias Xft fonts (true or false) # xft-dpi = Resolution for Xft in dots per inch (e.g. 96) # xft-hintstyle = What degree of hinting to use (hintnone, hintslight, hintmedium, or hintfull) # xft-rgba = Type of subpixel antialiasing (none, rgb, bgr, vrgb or vbgr) # [greeter] logo=/usr/share/pixmaps/xubuntu-logo-menu.png background=/usr/share/xfce4/backdrops/xubuntu-karmic.png #show-language-selector=false theme-name=retro1 font-name=Droid Sans 10 xft-antialias=true #xft-dpi= xft-hintstyle=hintfull xft-rgba=rgb show-language-selector=trueusers.conf
user@laptop:~$ cat /etc/lightdm/users.conf
# # User accounts configuration # # NOTE: If you have AccountsService installed on your system, then LightDM will # use this instead and these settings will be ignored # # minimum-uid = Minimum UID required to be shown in greeter # hidden-users = Users that are not shown to the user # hidden-shells = Shells that indicate a user cannot login # [UserAccounts] minimum-uid=500 hidden-users=nobody nobody4 noaccess hidden-shells=/bin/false /usr/sbin/nologinLogs
user@laptop:~$ cat /var/log/lightdm/
lightdm.log x-0-greeter.log.old x-1-greeter.log x-1.log x-0-greeter.log x-0.log x-1-greeter.log.olduser@laptop:~$ cat /var/log/lightdm/lightdm.log
cat: /var/log/lightdm/lightdm.log: Permission denied user@laptop:~$ sudo cat /var/log/lightdm/lightdm.log [sudo] password for user: [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log [+0.00s] DEBUG: Starting Light Display Manager 1.2.1, UID=0 PID=2677 [+0.00s] DEBUG: Loaded configuration from /etc/lightdm/lightdm.conf [+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager [+0.00s] DEBUG: Registered seat module xlocal [+0.00s] DEBUG: Registered seat module xremote [+0.00s] DEBUG: Adding default seat [+0.00s] DEBUG: Starting seat [+0.00s] DEBUG: Starting new display for greeter [+0.00s] DEBUG: Starting local X display [+0.00s] DEBUG: Using VT 7 [+0.00s] DEBUG: Activating VT 7 [+0.01s] DEBUG: Logging to /var/log/lightdm/x-0.log [+0.01s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0 [+0.01s] DEBUG: Launching X Server [+0.01s] DEBUG: Launching process 2683: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch [+0.01s] DEBUG: 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 [+0.91s] DEBUG: Got signal 10 from process 2683 [+0.91s] DEBUG: Got signal from X server :0 [+0.91s] DEBUG: Connecting to XServer :0 [+0.91s] DEBUG: Starting greeter [+0.91s] DEBUG: Started session 2688 with service 'lightdm', username 'lightdm' [+0.94s] DEBUG: Session 2688 authentication complete with return value 0: Success [+0.94s] DEBUG: Greeter authorized [+0.94s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log [+0.94s] DEBUG: Session 2688 running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/lightdm-gtk-greeter [+1.12s] DEBUG: Greeter connected version=1.2.1 [+1.12s] DEBUG: Greeter connected, display is ready [+1.12s] DEBUG: New display ready, switching to it [+1.12s] DEBUG: Activating VT 7 [+1.45s] DEBUG: Greeter start authentication [+1.45s] DEBUG: Started session 2733 with service 'lightdm', username '(null)' [+1.46s] DEBUG: Session 2733 got 1 message(s) from PAM [+1.46s] DEBUG: Prompt greeter with 1 message(s) [+2.98s] DEBUG: Continue authentication [+2.99s] DEBUG: Session 2733 got 1 message(s) from PAM [+2.99s] DEBUG: Prompt greeter with 1 message(s) [+8.36s] DEBUG: Continue authentication [+8.41s] DEBUG: Session 2733 authentication complete with return value 0: Success [+8.41s] DEBUG: Authenticate result for user user: Success [+8.42s] DEBUG: User user authorized [+8.42s] DEBUG: Greeter requests session xfce [+8.42s] DEBUG: Using session xfce [+8.42s] DEBUG: Stopping greeter [+8.42s] DEBUG: Session 2688: Sending SIGTERM [+8.46s] DEBUG: Session 2688 exited with return value 0 [+8.46s] DEBUG: Greeter quit [+8.47s] DEBUG: Dropping privileges to uid 1001 [+8.47s] DEBUG: Restoring privileges [+8.47s] DEBUG: Dropping privileges to uid 1001 [+8.47s] DEBUG: Writing /home/user/.dmrc [+8.54s] DEBUG: Restoring privileges [+8.58s] DEBUG: Starting session xfce as user user [+8.58s] DEBUG: Session 2733 running command /usr/sbin/lightdm-session startxfce4 [+8.60s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session0 [+8.60s] DEBUG: Greeter closed communication channel [+8.60s] DEBUG: Session 2733 exited with return value 1 [+8.60s] DEBUG: User session quit [+8.60s] DEBUG: Stopping display [+8.60s] DEBUG: Sending signal 15 to process 2683 [+8.77s] DEBUG: Process 2683 exited with return value 0 [+8.77s] DEBUG: X server stopped [+8.77s] DEBUG: Removing X server authority /var/run/lightdm/root/:0 [+8.77s] DEBUG: Releasing VT 7 [+8.77s] DEBUG: Display server stopped [+8.77s] DEBUG: Display stopped [+8.77s] DEBUG: Active display stopped, switching to greeter [+8.77s] DEBUG: Switching to greeter [+8.77s] DEBUG: Starting new display for greeter [+8.77s] DEBUG: Starting local X display [+8.77s] DEBUG: Using VT 7 [+8.77s] DEBUG: Logging to /var/log/lightdm/x-0.log [+8.77s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0 [+8.77s] DEBUG: Launching X Server [+8.77s] DEBUG: Launching process 2764: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch [+8.77s] DEBUG: Waiting for ready signal from X server :0 [+9.68s] DEBUG: Got signal 10 from process 2764 [+9.68s] DEBUG: Got signal from X server :0 [+9.68s] DEBUG: Connecting to XServer :0 [+9.68s] DEBUG: Starting greeter [+9.68s] DEBUG: Started session 2769 with service 'lightdm', username 'lightdm' [+9.70s] DEBUG: Session 2769 authentication complete with return value 0: Success [+9.71s] DEBUG: Greeter authorized [+9.71s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log [+9.71s] DEBUG: Session 2769 running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/lightdm-gtk-greeter [+9.87s] DEBUG: Greeter connected version=1.2.1 [+9.87s] DEBUG: Greeter connected, display is ready [+9.87s] DEBUG: New display ready, switching to it [+9.87s] DEBUG: Activating VT 7 [+9.87s] DEBUG: Stopping greeter display being switched from [+10.20s] DEBUG: Greeter start authentication [+10.20s] DEBUG: Started session 2814 with service 'lightdm', username '(null)' [+10.20s] DEBUG: Session 2814 got 1 message(s) from PAM [+10.20s] DEBUG: Prompt greeter with 1 message(s) [+110.97s] DEBUG: Got signal 15 from process 1 [+110.97s] DEBUG: Caught Terminated signal, shutting down [+110.97s] DEBUG: Stopping display manager [+110.97s] DEBUG: Stopping seat [+110.97s] DEBUG: Stopping display [+110.97s] DEBUG: Session 2769: Sending SIGTERM [+110.97s] DEBUG: Session 2814 terminated with signal 15 [+110.97s] DEBUG: Session 2814 failed during authentication [+110.97s] DEBUG: Authenticate result for user (null): Authentication stopped before completion [+111.04s] DEBUG: Session 2769 exited with return value 15 [+111.04s] DEBUG: Greeter quit [+111.04s] DEBUG: Sending signal 15 to process 2764 [+111.06s] DEBUG: Process 2764 exited with return value 0 [+111.06s] DEBUG: X server stopped [+111.06s] DEBUG: Removing X server authority /var/run/lightdm/root/:0 [+111.06s] DEBUG: Releasing VT 7 [+111.06s] DEBUG: Display server stopped [+111.06s] DEBUG: Display stopped [+111.06s] DEBUG: Seat stopped [+111.06s] DEBUG: Display manager stopped [+111.06s] DEBUG: Stopping daemon [+111.06s] DEBUG: Exiting with return value 0Installed packages
A web search suggested I need to install additional packages, such as lightdm-gtk-greeter, but I already have it installed.
user@laptop:~$ sudo dpkg -l lightdm* 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 Description +++-===========================-===========================-====================================================================== ii lightdm 1.2.1-0ubuntu1.1 Display Manager un lightdm-greeter <none> (no description available) un lightdm-greeter-example-gtk <none> (no description available) ii lightdm-gtk-greeter 1.1.5-0ubuntu1 LightDM GTK+ Greeter un lightdm-gtk-greeter-config <none> (no description available) user@laptop:~$Unity-greeter solution (not what I want)
Bug 850941, bug 804171 suggest using unity-greeter with lightdm. This might work, but lightdm does not depend on unity-greeter, and I am trying to use the lightdm-gtk-greeter alternative.
Problem interpretation
The way I see it, the problem is that the user session is not defined properly. It is started and closes off at once. Relevant snippet from the log:
[+8.58s] DEBUG: Starting session xfce as user user [+8.58s] DEBUG: Session 2733 running command /usr/sbin/lightdm-session startxfce4 [+8.60s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session0 [+8.60s] DEBUG: Greeter closed communication channel [+8.60s] DEBUG: Session 2733 exited with return value 1 [+8.60s] DEBUG: User session quit [+8.60s] DEBUG: Stopping display [+8.60s] DEBUG: Sending signal 15 to process 2683 [+8.77s] DEBUG: Process 2683 exited with return value 0 [+8.77s] DEBUG: X server stopped [+8.77s] DEBUG: Removing X server authority /var/run/lightdm/root/:0 [+8.77s] DEBUG: Releasing VT 7 [+8.77s] DEBUG: Display server stopped [+8.77s] DEBUG: Display stopped [+8.77s] DEBUG: Active display stopped, switching to greeterI am using the xfce desktop environment and any working examples would be appreciated.
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daisy over 11 yearsWas your X session crashed? Looks more like the session doesn't last for 10 secs -
didster over 11 yearsCheck ~/.xsession-errors
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