This one gave me enough worries – but somehow got the right link to sort this one out. First things first:
GDM = Gnome Desktop Manager
KDM = KDE Desktop Manager
tty = Teletype Terminals ( You get it usually with Ctrl+Alt+F1 )
You removed gdm – and installed kdm – but Fedora boots only to a tty shell. You login there and give kdm – the KDE boots up.
You want to skip the tty steps 🙂
$ sudo systemctl disable gdm $ sudo systemctl enable kdm
on the next boot, fedora boots up directly to KDE! Yay!
That would do 🙂