/usr/lib/x86_64-linux-gnu/libinftext-0.7.so is in libinfinity-0.7-dev 0.7.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libinftext-0.7.so.0.0.0
/usr/lib/x86_64-linux-gnu/libinftext-0.7.so.0.0.0