/usr/lib/x86_64-linux-gnu/libudunits2.so is in libudunits2-dev 2.1.23-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libudunits2.so.0.1.0
/usr/lib/x86_64-linux-gnu/libudunits2.so.0.1.0