The main focus at QA at the moment is release of Gluu CE 3.0, and probably this issue was overlooked when SP2 was tested. If you just need to evaluate Gluu 2.4 at the moment, you can try to fetch an older package, like [this one](https://repo.gluu.org/ubuntu/pool/main/xenial/gluu-oxd-server_2.4.4-7~xenial+Ub16.04_all.deb), it should work ok there. Later on you'll be able to upgrade it to SP3.