/usr/lib/libpgapack-serial1.so.1 is in libpgapack-serial1 1.1.1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libpgapack-serial1.so.1.0
/usr/lib/libpgapack-serial1.so.1.0