/usr/lib/x86_64-linux-gnu/libQtPublishSubscribe.so is in qtmobility-dev 1.2.0-3ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libQtPublishSubscribe.so.1.2.0
/usr/lib/x86_64-linux-gnu/libQtPublishSubscribe.so.1.2.0