i3hunor@HunorT480 ~]$ journalctl --boot=0 --unit=lightdm
Jan 22 09:52:39 HunorT480 systemd[1]: Starting Light Display Manager...
Jan 22 09:52:39 HunorT480 lightdm[290272]: Failed to use bus name org.freedesktop.DisplayMan>
Jan 22 09:52:39 HunorT480 systemd[1]: lightdm.service: Main process exited, code=exited, sta>
Jan 22 09:52:39 HunorT480 systemd[1]: lightdm.service: Failed with result 'exit-code'.
Jan 22 09:52:39 HunorT480 systemd[1]: Failed to start Light Display Manager.
Jan 22 09:52:39 HunorT480 systemd[1]: lightdm.service: Scheduled restart job, restart counte>
Jan 22 09:52:39 HunorT480 systemd[1]: Stopped Light Display Manager.
Jan 22 09:52:39 HunorT480 systemd[1]: Starting Light Display Manager...
Jan 22 09:52:40 HunorT480 lightdm[290289]: Failed to use bus name org.freedesktop.DisplayMan>
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Main process exited, code=exited, sta>
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Failed with result 'exit-code'.
Jan 22 09:52:40 HunorT480 systemd[1]: Failed to start Light Display Manager.
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Scheduled restart job, restart counte>
Jan 22 09:52:40 HunorT480 systemd[1]: Stopped Light Display Manager.
Jan 22 09:52:40 HunorT480 systemd[1]: Starting Light Display Manager...
Jan 22 09:52:40 HunorT480 lightdm[290299]: Failed to use bus name org.freedesktop.DisplayMan>
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Main process exited, code=exited, sta>
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Failed with result 'exit-code'.
Jan 22 09:52:40 HunorT480 systemd[1]: Failed to start Light Display Manager.
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Scheduled restart job, restart counte>
Jan 22 09:52:40 HunorT480 systemd[1]: Stopped Light Display Manager.
Jan 22 09:52:40 HunorT480 systemd[1]: Starting Light Display Manager...
Jan 22 09:52:40 HunorT480 lightdm[290310]: Failed to use bus name org.freedesktop.DisplayMan>
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Main process exited, code=exited, sta>
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Failed with result 'exit-code'.
Jan 22 09:52:40 HunorT480 systemd[1]: Failed to start Light Display Manager.
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Scheduled restart job, restart counte>
Jan 22 09:52:40 HunorT480 systemd[1]: Stopped Light Display Manager.
Jan 22 09:52:40 HunorT480 systemd[1]: Starting Light Display Manager...
Jan 22 09:52:40 HunorT480 lightdm[290326]: Failed to use bus name org.freedesktop.DisplayMan>
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Main process exited, code=exited, sta>
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Failed with result 'exit-code'.
Jan 22 09:52:40 HunorT480 systemd[1]: Failed to start Light Display Manager.
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Scheduled restart job, restart counte>
Jan 22 09:52:40 HunorT480 systemd[1]: Stopped Light Display Manager.
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Start request repeated too quickly.
Jan 22 09:52:40 HunorT480 systemd[1]: lightdm.service: Failed with result 'exit-code'.
Jan 22 09:52:40 HunorT480 systemd[1]: Failed to start Light Display Manager.
Okay, i dont really understand, but now everything was fine.
I dont know what happened, but it works now altough i just changed to ssdm back to lightdm and thats all.
Anyway, thank you all!