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
I appreciate the help, I did use dconf editor but I haven’t manually cleared these out and updated dconf I’ll try this out, worst case GDM is still busted.
