/usr/ is in libbluetooth-dev 4.101-0ubuntu13.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libbluetooth.a
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/bluez.pc
/usr/include/
/usr/include/bluetooth/
/usr/include/bluetooth/hidp.h
/usr/include/bluetooth/sdp_lib.h
/usr/include/bluetooth/a2mp.h
/usr/include/bluetooth/l2cap.h
/usr/include/bluetooth/bluetooth.h
/usr/include/bluetooth/sdp.h
/usr/include/bluetooth/sco.h
/usr/include/bluetooth/cmtp.h
/usr/include/bluetooth/hci_lib.h
/usr/include/bluetooth/uuid.h
/usr/include/bluetooth/hci.h
/usr/include/bluetooth/mgmt.h
/usr/include/bluetooth/rfcomm.h
/usr/include/bluetooth/bnep.h
/usr/share/
/usr/share/doc/
/usr/share/doc/libbluetooth-dev/
/usr/share/doc/libbluetooth-dev/copyright
/usr/lib/x86_64-linux-gnu/libbluetooth.so
/usr/share/doc/libbluetooth-dev/README
/usr/share/doc/libbluetooth-dev/TODO.gz
/usr/share/doc/libbluetooth-dev/NEWS.Debian.gz
/usr/share/doc/libbluetooth-dev/AUTHORS
/usr/share/doc/libbluetooth-dev/changelog.Debian.gz