/usr/lib/x86_64-linux-gnu/libGkArrays.so is in libgkarrays-dev 2.1.0+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libGkArrays.so.1.1.0
/usr/lib/x86_64-linux-gnu/libGkArrays.so.1.1.0