/usr/lib/x86_64-linux-gnu/libtiffxx.so is in libtiff4-dev 3.9.5-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtiffxx.so.0.0.8
/usr/lib/x86_64-linux-gnu/libtiffxx.so.0.0.8