/usr/lib/x86_64-linux-gnu/libsscm.so is in libsscm-dev 0.8.5-4.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsscm.so.3.0.1
/usr/lib/x86_64-linux-gnu/libsscm.so.3.0.1