systemctl status lightdm
lightdm.service: Start request repeated too quickly.
lightdm.service: Failed with result 'exit-code'.
Failed to start lightdm.service - Light Display Manager.
lightdm.service: Triggering OnFailure= dependencies.权威文档https://wiki.archlinux.org/title/LightDM#LightDM_does_not_appear_or_monitor_only_displays_TTY_output
LightDM does not appear or monitor only displays TTY output
It may happen that your system boots so fast that LightDM service is started before your graphics drivers are properly loaded. If this is your case, you will want to add the following to your lightdm.conf file:
/etc/lightdm/lightdm.conf
[LightDM]
logind-check-graphical=true