We did a binary upload to Debian, but seems that Ubuntu syncs the packages by source and builds them again. I think someone at the Ubuntu side should do a binary upload to e.g. 2.13-4ubuntu1.
I filed a bug <https://bugs.launchpad.net/ubuntu/+source/gradle/+bug/1622550> about this to Launchpad. __ This is the maintainer address of Debian's Java team <http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-java-maintainers>. Please use debian-j...@lists.debian.org for discussions and questions.