More detailed: Bug 31251 - gdm login loops forever with NVIDIA GP102 [GeForce GTX 1080 Ti] graphics
Possible solution...
Note: GQemoo-v2.1 was used to find out the cause of the error...
ScreenShot_1-Installing-without-X: https://i.ibb.co/CJ1XjZX/1-Installing-without-X.png
ScreenShot_2-urpmi_task-gmone-minimal: https://i.ibb.co/qF5GW5F/2-urpmi-task-gmone-minimal.png
ScreenShot_3-urpme_gstreamer1.0-vaapi: https://i.ibb.co/8NH4zNF/3-urpme-gstreamer1-0-vaapi.png
ScreenShot_4_Running_GNOME_(startx): https://i.ibb.co/SvsbX9B/4-Running-GNOME-startx.png
What to do:
---
1. Installing Mageia-9(Cauldron) without X from the network (Mageia-Cauldron-netinstall-nonfree-x86_64.iso)
2. urpmi --auto task-gmone-minimal
3. urpme --auto gstreamer1.0-vaapi
4. reboot; startx (with user privileges)
This article was also used: https://bugs.launchpad.net/ubuntu/+sour ... ug/1745345