/usr/lib/x86_64-linux-gnu/libgtkdataboxmm.so.0 is in libgtkdataboxmm0 0.9.4-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgtkdataboxmm.so.0.0.2
/usr/lib/x86_64-linux-gnu/libgtkdataboxmm.so.0.0.2