/usr/lib/x86_64-linux-gnu/libqtubuntu-media-signals.so is in libqtubuntu-media-signals-dev 0.3+14.04.20140307-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libqtubuntu-media-signals.so.1