/usr/share/java/gluegen2-rt.jar is in libgluegen2-rt-java 2.1.5-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/gluegen2-2.1.5-rt.jar
/usr/share/java/gluegen2-2.1.5-rt.jar