That was the lightdm-gtk-greeter on EndeavourOS ARM with XFCE4 for the DE.
Although at the lightdm greeter screen, it makes no difference what the DE is.
Pudge
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It’s hard to know sometimes.
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I again used this just now on EndeavourOS Mate & it worked like a charm as it did on vanilla Arch/Xfce. Thank you!
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You are welcome.
I am glad it helped.
Pudge
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Thank you so much 
After installing slick greeter all I had was a black background, but your guide has helped me fix it, much appreciated!
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Not sure if this is possible or not, would it be possible to have 5 or 6 random pictures and it randomly selects a picture on boot? Instead of the same picture? 
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It might be possible to swap the backgrounds “behind its back” so to speak - by, for instance, copying a different picture to the path/filename that the greeter is looking for. A simple script to do so, selecting randomly from a list to copy from.
Linux almost always has a way, if not a feature!
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Coming from Mint, I did like the slick greeter and I have it set up on EOS as an alternate. I do like the way you can reposition the login box on the GTK greeter though. Wish I could do that with the slick greeter as well.
Go to duckduckgo and type in
lightdm slick greeter
Four of the first 6 images are from this Topic.
Pudge
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