/usr/lib/x86_64-linux-gnu/libGraphUnidraw.so is in ivtools-dev 1.2.11a1-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libGraphUnidraw.so.1.2.8
/usr/lib/x86_64-linux-gnu/libGraphUnidraw.so.1.2.8