Lightdm fails to start after Dec. 6 updates

Support Xfce
1

After Dec 6 updates, Manjaro XFCE fails to reach login screen. I find this about lightdm from systemctl status lightdm:

○ lightdm.service - Light Display Manager
         Loaded: error (Reason: Unit lightdm.service failed to load properly, please adjust/correct and reload service manager: File exists)
 Active: inactive (dead)
   Docs: man:lightdm(1)

Dec 12 05:35:49 Zotac systemd[1]: lightdm.service: Two services allocated for the same bus name org.freedesktop.DisplayManager, refusing operation.
Dec 12 05:49:19 Zotac systemd[1]: lightdm.service: Two services allocated for the same bus name org.freedesktop.DisplayManager, refusing operation.

``

How might I adjust/correct this error? Thank you for assistance.

2

are you using plymouth? if yes disable it and try again

3

Yes. How do I disable it?

4 
systemctl disable lightdm-plymouth.service
5

Result of the suggested command:

○ lightdm-plymouth.service - Light Display Manager
 Loaded: loaded (/usr/lib/systemd/system/lightdm-plymouth.service;         disabled; preset: disabled)
 Active: inactive (dead)

This did not fix the problem. In fact, after reboot I find lightdm was disabled as well:

○ lightdm.service - Light Display Manager
 Loaded: loaded (/usr/lib/systemd/system/lightdm.service; disabled; preset: disabled)
 Active: inactive (dead)
   Docs: man:lightdm(1)

Net result: no change.

I reenabled lightdm and restarted. Now I get different errors than in the previous post:

× lightdm.service - Light Display Manager
 Loaded: loaded (/usr/lib/systemd/system/lightdm.service; enabled; preset: disabled)
 Active: failed (Result: exit-code) since Mon 2022-12-12 06:46:52 MST; 2min 58s ago
  Duration: 1.459s
   Docs: man:lightdm(1)
Process: 932 ExecStart=/usr/bin/lightdm (code=exited, status=1/FAILURE)
  Main PID: 932 (code=exited, status=1/FAILURE)
    CPU: 456ms

Dec 12 06:46:52 Zotac systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 10.
Dec 12 06:46:52 Zotac systemd[1]: Stopped Light Display Manager.
Dec 12 06:46:52 Zotac systemd[1]: lightdm.service: Start request repeated too quickly.
Dec 12 06:46:52 Zotac systemd[1]: lightdm.service: Failed with result 'exit-code'.
Dec 12 06:46:52 Zotac systemd[1]: Failed to start Light Display Manager.

Are there further suggestions?

6

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lightdm failed 10 times ! Why ?

What about the logfiles ?

  • for lightdm
  • for xorg
7

Try looking for logs:

journalctl --boot=0 --unit=lightdm --no-pager
8

Thanks for your attempts to help here, but I decided to install sddm. I encountered a (hopefully) minor problem with that which I could not solve. I started a new thread about it.