/usr/lib/x86_64-linux-gnu/libslicot.so is in libslicot-dev 5.0+20101122-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libslicot.so.0
/usr/lib/x86_64-linux-gnu/libslicot.so.0