/usr/share/ant/lib/ant-apache-bcel.jar is in ant-optional 1.9.3-2ubuntu0.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/ant/lib/../../java/ant-apache-bcel-1.9.3.jar
/usr/share/ant/lib/../../java/ant-apache-bcel-1.9.3.jar