This file is indexed.

/usr/share/gdm/greeter.dconf-defaults is in gdm3 3.18.3-0ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# These are the options for the greeter session that can be set 
# through GSettings. Any GSettings setting that is used by the 
# greeter session can be set here.

# Note that you must configure the path used by dconf to store the 
# configuration, not the GSettings path.


# Theming options
# ===============
#  - Change the GTK+ theme
# [org/gnome/desktop/interface]
# gtk-theme='Adwaita'
#  - Use another background
# [org/gnome/desktop/background]
# picture-uri='file:///usr/share/themes/Adwaita/backgrounds/stripes.jpg'
# picture-options='zoom'
#  - Or no background at all
# [org/gnome/desktop/background]
# picture-options='none'
# primary-color='#000000'

# Login manager options
# =====================
#[org/gnome/login-screen]
#logo='/usr/share/icons/gnome/48x48/places/debian-swirl.png'
#fallback-logo='/usr/share/icons/gnome/48x48/places/debian-swirl.png'

# - Disable user list
# disable-user-list=true
# - Disable restart buttons
# disable-restart-buttons=true
# - Show a login welcome message
# banner-message-enable=true
# banner-message-text='Welcome'