/usr/share/ is in gnome-initial-setup 3.28.0-2ubuntu6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/applications/
/usr/share/doc/
/usr/share/doc/gnome-initial-setup/
/usr/share/doc/gnome-initial-setup/NEWS.gz
/usr/share/doc/gnome-initial-setup/README
/usr/share/doc/gnome-initial-setup/changelog.Debian.gz
/usr/share/doc/gnome-initial-setup/copyright
/usr/share/gdm/
/usr/share/gdm/greeter/
/usr/share/gdm/greeter/applications/
/usr/share/gdm/greeter/applications/gnome-initial-setup.desktop
/usr/share/gdm/greeter/applications/setup-shell.desktop
/usr/share/gnome-session/
/usr/share/gnome-session/sessions/
/usr/share/gnome-session/sessions/gnome-initial-setup.session
/usr/share/gnome-shell/
/usr/share/gnome-shell/modes/
/usr/share/gnome-shell/modes/initial-setup.json
/usr/share/polkit-1/
/usr/share/polkit-1/actions/
/usr/share/polkit-1/actions/com.ubuntu.welcome.policy
/usr/share/polkit-1/rules.d/
/usr/share/polkit-1/rules.d/20-gnome-initial-setup.rules
/usr/share/applications/gnome-initial-setup.desktop