/usr/share/doc/liblwipv6-dev/README is in liblwipv6-dev 1.5a-2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/liblwipv6-dev/../liblwipv6-2/README
/usr/share/doc/liblwipv6-dev/../liblwipv6-2/README