/usr/lib/jvm/default-java is in default-jre-headless 1:1.6-43ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/jvm/java-1.6.0-openjdk-amd64
/usr/lib/jvm/java-1.6.0-openjdk-amd64