/usr/lib/jni/libcephfs_jni.so.1 is in libcephfs-jni 10.1.2-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/jni/libcephfs_jni.so.1.0.0
/usr/lib/jni/libcephfs_jni.so.1.0.0