Like how I used GDM-Settings on Pop_OS without knowing GDM-Settings is for OLD gdm, and now I have to use LightDM because I can’t find the config files that are broken in GDM that cause it to have no styling and be black font with trails anytime something moves?
(and yes I have reinstalled it, gnome-shell, pop-theme, etc even with forcing dpkg to re-write over config files. I’ve manually gone through and deleted config files and reinstalled to redownload them, I cannot get GDM back to even default GDM let alone the pop version.)
See this is the exact sort of problem I always had with different flavours of Ubuntu. I’d always muck up my install with misconfigured shit and it would be too much time and effort to fix so I’d have to nuke the whole OS every now and then 😜
I honestly just wish there was some really good GDM docs I could find to make it easy to reset it to default.
The Arch wiki may have some ideas for you - tl;dr is that GDM uses a global dconf db over in /etc/ and this might be the root of your problem (these configs might not get cleaned up with a --purge?) I’m a LightDM user so best I can do to help: https://wiki.archlinux.org/title/GDM#dconf_configuration
