/usr/lib/x86_64-linux-gnu/libfontconfig.so is in libfontconfig1-dev 2.11.0-0ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libfontconfig.so.1.8.0
/usr/lib/x86_64-linux-gnu/libfontconfig.so.1.8.0