/usr/lib/libruby1.8.so.1.8 is in libruby1.8 1.8.7.352-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libruby1.8.so.1.8.7
/usr/lib/libruby1.8.so.1.8.7