/usr/lib/libruby-1.9.1.so.1.9 is in libruby1.9.1 1.9.3.0-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libruby-1.9.1.so.1.9.1
/usr/lib/libruby-1.9.1.so.1.9.1