/usr/lib/x86_64-linux-gnu/libixml.so.2 is in libupnp6 1:1.6.19+git20160116-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libixml.so.2.0.8
/usr/lib/x86_64-linux-gnu/libixml.so.2.0.8