/usr/lib/x86_64-linux-gnu/libgphoto2.so is in libgphoto2-dev 2.5.4-1.1+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgphoto2.so.6.0.0
/usr/lib/x86_64-linux-gnu/libgphoto2.so.6.0.0