/usr/lib/jni/libjnexus.so is in libnexus0-java 4.3.2-svn1921-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/jni/libjnexus.so.0.5.0
/usr/lib/jni/libjnexus.so.0.5.0