/usr/lib/x86_64-linux-gnu/libcephfs.so is in libcephfs-dev 0.80.11-0ubuntu1.14.04.3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcephfs.so.1.0.0
/usr/lib/x86_64-linux-gnu/libcephfs.so.1.0.0