/usr/share/GConf/gsettings/gnome-shell-overrides.convert is in gnome-shell-common 3.28.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [org.gnome.shell.overrides]
attach-modal-dialogs = /desktop/gnome/shell/windows/attach_modal_dialogs
edge-tiling = /desktop/gnome/shell/windows/edge_tiling
workspaces-only-on-primary = /desktop/gnome/shell/windows/workspaces_only_on_primary
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