/usr/lib/x86_64-linux-gnu/libpng16.so.16 is in libpng16-16 1.6.28-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpng16.so.16.28.0
/usr/lib/x86_64-linux-gnu/libpng16.so.16.28.0