/usr/lib/x86_64-linux-gnu/librbd.so.1 is in librbd1 12.2.4-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/librbd.so.1.12.0
/usr/lib/x86_64-linux-gnu/librbd.so.1.12.0