/usr/share/java/jung-graph-impl.jar is in libjung-free-java 2.0.1+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/jung-graph-impl-2.0.1.jar
/usr/share/java/jung-graph-impl-2.0.1.jar