/usr/share/doc/liblinphone-dev/README is in liblinphone-dev 3.3.2-4.1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/liblinphone-dev/../libmediastreamer0/README
/usr/share/doc/liblinphone-dev/../libmediastreamer0/README