/usr/share/doc/openjdk-6-jre-headless/demo/jvmti is in openjdk-6-demo 6b31-1.13.3-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/openjdk-6-jre-headless/demo/../../../../lib/jvm/java-6-openjdk-amd64/demo/jvmti