/usr/lib/x86_64-linux-gnu/libpostproc.so.52 is in libpostproc52 4:0.8.17-0ubuntu0.12.04.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpostproc.so.52.0.0
/usr/lib/x86_64-linux-gnu/libpostproc.so.52.0.0