/usr/lib/x86_64-linux-gnu/libspectrum.so is in libspectrum-dev 1.1.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libspectrum.so.8.1.0
/usr/lib/x86_64-linux-gnu/libspectrum.so.8.1.0