/usr/lib/x86_64-linux-gnu/libtexttools.so is in libtexttools5-dev 2.1.0-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtexttools.so.7
/usr/lib/x86_64-linux-gnu/libtexttools.so.7