Not sure if this is the correct section or not. I updated one of my machines today after several weeks and upon reboot it goes directly to into TTY. System is using systemd-boot and EFI, no grub. I tried fallback, that does the same. Tried installing zen, that does the same. Was hoping LTS would fix this, but it goes straight to TTY also.
Sorry for the confusion, I tried startx and startlxqt, neither worked. No usable desktop GUI could be reached.
From TTY I installed plasma and Wayland and ran startplasma-wayland just to see what would happen. But yes, as you point out, the DM-service isn’t activated or activating properly I’m guessing. But why does it reach a usable GUI with Wayland but not X11?
That way you can choose to boot into Plasma or Lxqt from the DM’s greeter (“login-page” as you named it).
In that case it makes sense to either delete the previously edited ~/.xinitrc (in your home-folder), or just overwrite it with the xorg-xinit standard-file, via: sudo cp /etc/X11/xinit/xinitrc ~/.xinitrc