/usr/share/ is in gsettings-desktop-schemas 3.28.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/gsettings-desktop-schemas/NEWS.gz
/usr/share/GConf/
/usr/share/GConf/gsettings/
/usr/share/GConf/gsettings/gsettings-desktop-schemas.convert
/usr/share/GConf/gsettings/wm-schemas.convert
/usr/share/doc/
/usr/share/doc/gsettings-desktop-schemas/
/usr/share/doc/gsettings-desktop-schemas/AUTHORS
/usr/share/doc/gsettings-desktop-schemas/README
/usr/share/doc/gsettings-desktop-schemas/changelog.Debian.gz
/usr/share/doc/gsettings-desktop-schemas/copyright
/usr/share/glib-2.0/
/usr/share/glib-2.0/schemas/
/usr/share/glib-2.0/schemas/10_gsettings-desktop-schemas.gschema.override
/usr/share/glib-2.0/schemas/org.gnome.desktop.a11y.applications.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.a11y.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.a11y.keyboard.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.a11y.magnifier.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.a11y.mouse.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.app-folders.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.background.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.calendar.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.datetime.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.default-applications.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.enums.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.input-sources.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.interface.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.lockdown.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.media-handling.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.notifications.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.peripherals.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.privacy.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.screensaver.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.search-providers.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.session.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.sound.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.thumbnail-cache.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.thumbnailers.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.wm.keybindings.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.desktop.wm.preferences.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.system.locale.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.system.location.gschema.xml
/usr/share/glib-2.0/schemas/org.gnome.system.proxy.gschema.xml