/usr/lib/libAudioMask.so is in libaudiomask-dev 1.0-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /build/buildd/libaudiomask-1.0/debian/tmp/usr/lib/libAudioMask.so.1
/build/buildd/libaudiomask-1.0/debian/tmp/usr/lib/libAudioMask.so.1