/usr/share/jetty/lib/jetty-util.jar is in libjetty-java 6.1.26-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/jetty/lib/../../java/jetty-util-6.1.26.jar
/usr/share/jetty/lib/../../java/jetty-util-6.1.26.jar