/usr/lib/x86_64-linux-gnu/librtaudio.so.5 is in librtaudio5a 4.1.2~ds0-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/librtaudio.so.5.0.0
/usr/lib/x86_64-linux-gnu/librtaudio.so.5.0.0