/usr/lib/x86_64-linux-gnu/libunbound.so.2 is in libunbound2 1.6.7-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libunbound.so.2.5.6
/usr/lib/x86_64-linux-gnu/libunbound.so.2.5.6