Description of problem:
I've used Fedora 23 with KDM display manager up to a couple of days ago.
Then I've upgraded to Fedora 25. Unfortunately, after the upgrade the KDM display manager didn't show up anymore.
Checking /etc/systemd/system/display-manager.service I noticed it wasn't present, so I reenable the service with:
systemctl enable kdm.service
and it started to work again.

Anyhow I'm a bit puzzled on why it stopped to work in first place.


Version-Release number of selected component (if applicable):
systemd-231-10.fc25.x86_64


How reproducible:
always

Steps to Reproduce:
1. Fedora 23 with KDM
2. upgrade to Fedora 25

Actual results:
No display manager after upgrade.

Expected results:
KDM display manager starts, or at least, it is replaced with another display manager if it is actually deprecated.