Hello all 
First question on the forum, how can I change the greeter for lightdm ? I would like to use the slick-greeter, but I don’t see a way to do that.
I tried to create a lightdm.conf in /etc/lightdm but it broke my display manager 
So I suppose that therer is an “OpenSuse” way to do that ?
Best reagards,
Set greeter-session property in lightdm Seat configuration. Read /usr/share/doc/packages/lightdm/lightdm.conf.example or search Internet for countless articles how to configure LightDM.
Not sure if you have lightdm installed, but, if you want to see what display manager you are using, if you have several installed:
sudo update-alternatives --list default-displaymanager
To change:
sudo update-alternatives --config default-displaymanager
And then select the one you want either by number or arrowing down to the highlighted choice, (can’t remember, the console gives the options)
Or, haven’t done this one, but another option:
sudo update-alternatives --set default-displaymanager /usr/lib/X11/displaymanagers/<choice>
Where “choice” is what you choose, like “lightdm”?? Also not sure if the X in X11 is in caps or not, as historically it often is in caps, but haven’t tried to this to see . . . .
He only wants to replace the theme of lightdm I guess
Please see this old thread: