/usr/share/ant/lib/ant-commons-net.jar is in ant1.7-optional 1.7.1-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/ant/lib/../../java/ant-commons-net-1.7.1.jar
/usr/share/ant/lib/../../java/ant-commons-net-1.7.1.jar