/usr/lib/x86_64-linux-gnu/libgstsignalprocessor-0.10.so is in libgstreamer-plugins-bad0.10-dev 0.10.23-7.2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgstsignalprocessor-0.10.so.23.0.0