/usr/lib/x86_64-linux-gnu/libfsobasics.so is in libfsobasics-dev 0.9.99+git20110804-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libfsobasics.so.0.0.0
/usr/lib/x86_64-linux-gnu/libfsobasics.so.0.0.0