/usr/lib/x86_64-linux-gnu/libitpp.so.8 is in libitpp8v5 4.3.1-7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libitpp.so.8.2.1
/usr/lib/x86_64-linux-gnu/libitpp.so.8.2.1