/usr/ is in dbus-user-session 1.12.2-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/systemd/
/usr/lib/systemd/user/
/usr/lib/
/usr/lib/systemd/user/dbus.service
/usr/lib/systemd/user/dbus.socket
/usr/lib/systemd/user/sockets.target.wants/
/usr/share/
/usr/share/doc/
/usr/share/doc/dbus-user-session/
/usr/share/doc/dbus-user-session/copyright
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/dbus-user-session
/usr/lib/systemd/user/sockets.target.wants/dbus.socket
/usr/share/doc/dbus-user-session/AUTHORS.gz
/usr/share/doc/dbus-user-session/NEWS.gz
/usr/share/doc/dbus-user-session/README.gz
/usr/share/doc/dbus-user-session/changelog.Debian.gz