JabRef is an open source bibliography reference manager. To install it on ubuntu, you must before make sure you have the correct java version installed
If this does not report to be a product from Oracle (for instance tells you that it is a GCJ VM) even if you have installed the Oracle JVM then you need to change your setup. see http://jabref.sourceforge.net/faq.php for more details.
sudo apt-get update
sudo apt-get install jabref
if this doesn’t work, check if you have the multiverse repo installed and retry.