GDM Theme

If you are using GNOME, I recommend using Login Manager Settings to change the GDM theme to qualia.

You cannot use the GDM theme if you chose to install all of the themes in ~/.local/share, which you should probably only do if you are using an immutable OS.

If you change the GDM theme and later choose to uninstall the theme, reset the GDM theme to default first or you might encounter issues.