I can’t enable lightdm using command: sudo systemctl enable lightdm. And my system is now blocked on tty mode. I’ve update it using the method to update it on tty. But it doesn’t work.
Have you checked for errors in /var/log/Xorg.0.log? It seems your X session is crashing before lightdm can even be displayed. Please post your Xorg.0.log here.
How to do that