/usr/lib/x86_64-linux-gnu/libSym.so.3 is in coinor-libsymphony3 5.5.6-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libSym.so.3.5.6
/usr/lib/x86_64-linux-gnu/libSym.so.3.5.6