/usr/lib/x86_64-linux-gnu/libHepMC.so is in libhepmc-dev 2.06.09-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libHepMC.so.4.0.0
/usr/lib/x86_64-linux-gnu/libHepMC.so.4.0.0