/usr/share/netbeans/java5/ant/etc is in libnb-java5-java 7.0.1+dfsg1-5ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/netbeans/java5/ant/../../../ant/etc
/usr/share/netbeans/java5/ant/../../../ant/etc