/usr/lib/x86_64-linux-gnu/libguestfs.so is in libguestfs-dev 1:1.34.6-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libguestfs.so.0.468.0
/usr/lib/x86_64-linux-gnu/libguestfs.so.0.468.0