/usr/lib/x86_64-linux-gnu/libwebp.so.6 is in libwebp6 0.6.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libwebp.so.6.0.2
/usr/lib/x86_64-linux-gnu/libwebp.so.6.0.2