Comment 26 for bug 1876460

I don't think unity/lightdm change user account details, there was a greeter option to list/hide users but that was just lightdm configuration.

thanks for upstreaming https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/988 , they have proposed a fix for review now so that should address the 'can't add user' issue

the user flagged as system is not a gnome-control-center issue and it's a bit difficult to say what made the user being flagged as system one at this point, I will still check if accountsservice fail to reconsider status when user change though