Please how avoid problems on GDM after install nvidia drivers from rpmfusion on fedora 28 workstation

edit

On fedora 28 workstation

Now you can successfully solve the GDM issue.

The solution is change gdm(display manager) to another , for example lightdm. You must run your pc without a GUI interface, you could do that by change run level to 3 on GRUB2.

First you have to change runlevel to 3
Login with your user name account and password.
Then install lightdm

$ sudo dnf install lightdm

Now disable gdm.service and enable lightdm

$ sudo systemctl disable gdm.service
$ sudo systemctl enable lightdm

Stop gdm and start lightdm

$ sudo systemctl stop gdm
$ sudo systemctl start lightdm

Then reboot your pc

$ reboot

thanks pals, greetings from Ecuador, you could use open drivers but if you like to install proprietary driver , it is possible on fedora 28 workstation.