/usr/lib/libtdstringutilities.so.2 is in librsplib2 3.0.1-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libtdstringutilities.so.2.0.8
/usr/lib/libtdstringutilities.so.2.0.8