/usr/lib/x86_64-linux-gnu/libpyside.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/libpyside1.2.so
/usr/lib/x86_64-linux-gnu/libpyside1.2.so