/usr/share/GConf/gsettings/gnome-session.convert is in gnome-session-bin 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 | [org.gnome.SessionManager]
auto-save-session = /apps/gnome-session/options/auto_save_session
logout-prompt = /apps/gnome-session/options/logout_prompt
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