/usr/lib/speech-dispatcher/libsdaudio.so is in libspeechd-dev 0.7.1-6ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/speech-dispatcher/libsdaudio.so.2.0.4
/usr/lib/speech-dispatcher/libsdaudio.so.2.0.4