/usr/share/gdm/dconf/locks/00-upstream-settings-locks 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 | /org/gnome/desktop/a11y/keyboard/enable
/org/gnome/desktop/background/show-desktop-icons
/org/gnome/desktop/default-applications/terminal/exec
/org/gnome/desktop/interface/toolkit-accessibility
/org/gnome/desktop/lockdown/disable-application-handlers
/org/gnome/desktop/lockdown/disable-command-line
/org/gnome/desktop/lockdown/disable-lock-screen
/org/gnome/desktop/lockdown/disable-log-out
/org/gnome/desktop/lockdown/disable-printing
/org/gnome/desktop/lockdown/disable-print-setup
/org/gnome/desktop/lockdown/disable-save-to-disk
/org/gnome/desktop/lockdown/disable-user-switching
/org/gnome/desktop/session/session-name
/org/gnome/desktop/sound/event-sounds
/org/gnome/settings-daemon/plugins/media-keys/calculator
/org/gnome/settings-daemon/plugins/media-keys/eject
/org/gnome/settings-daemon/plugins/media-keys/email
/org/gnome/settings-daemon/plugins/media-keys/help
/org/gnome/settings-daemon/plugins/media-keys/home
/org/gnome/settings-daemon/plugins/media-keys/media
/org/gnome/settings-daemon/plugins/media-keys/next
/org/gnome/settings-daemon/plugins/media-keys/pause
/org/gnome/settings-daemon/plugins/media-keys/play
/org/gnome/settings-daemon/plugins/media-keys/previous
/org/gnome/settings-daemon/plugins/media-keys/screensaver
/org/gnome/settings-daemon/plugins/media-keys/search
/org/gnome/settings-daemon/plugins/media-keys/stop
/org/gnome/settings-daemon/plugins/media-keys/www
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