/usr/lib/ is in libadasockets5-dev 1.9-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/libadasockets.a
/usr/lib/pkgconfig/
/usr/lib/pkgconfig/adasockets.pc
/usr/lib/ada/
/usr/lib/ada/adalib/
/usr/lib/ada/adalib/adasockets/
/usr/lib/ada/adalib/adasockets/sockets-utils.ali
/usr/lib/ada/adalib/adasockets/sockets-types.ali
/usr/lib/ada/adalib/adasockets/sockets-thin.ali
/usr/lib/ada/adalib/adasockets/sockets-naming.ali
/usr/lib/ada/adalib/adasockets/sockets-multicast.ali
/usr/lib/ada/adalib/adasockets/sockets-stream_io.ali
/usr/lib/ada/adalib/adasockets/sockets.ali
/usr/lib/ada/adalib/adasockets/sockets-constants.ali
/usr/lib/ada/adalib/adasockets/sockets-link.ali
/usr/lib/libadasockets.la
/usr/lib/libadasockets.so