/usr/lib/x86_64-linux-gnu/libgmtk.so.1 is in libgmtk1 1.0.8-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgmtk.so.1.0.8
/usr/lib/x86_64-linux-gnu/libgmtk.so.1.0.8