/usr/lib/x86_64-linux-gnu/libtachyon-mt-thr.so is in libtachyon-mt-0-dev 0.99~b6+dsx-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtachyon-mt-thr.so.0.0.0
/usr/lib/x86_64-linux-gnu/libtachyon-mt-thr.so.0.0.0