/usr/lib/libmapnik.so.2.2 is in libmapnik2.2 2.2.0+ds1-7+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libmapnik.so.2.2.0
/usr/lib/libmapnik.so.2.2.0