/usr/lib/x86_64-linux-gnu/libpyside.cpython-35m-x86_64-linux-gnu.so is in libpyside-dev 1.2.2-2build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpyside.cpython-35m-x86_64-linux-gnu.so.1.2