/usr/lib/x86_64-linux-gnu/libtinyxml2.so is in libtinyxml2-dev 2.2.0-1.1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtinyxml2.so.2
/usr/lib/x86_64-linux-gnu/libtinyxml2.so.2