/lib/x86_64-linux-gnu/libtirpc.so.1 is in libtirpc1 0.2.2-5ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/x86_64-linux-gnu/libtirpc.so.1.0.10
/lib/x86_64-linux-gnu/libtirpc.so.1.0.10