/usr/share/gdm/greeter.dconf-defaults is in gdm3 3.28.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | # 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/hicolor/48x48/emblems/emblem-debian-white.png'
#fallback-logo='/usr/share/icons/hicolor/48x48/emblems/emblem-debian-white.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'
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