If you blinked a few times, you wouldn’t see much change in the 13.10 to 14.04 server releases, as most items are software updates to existing packages — but as a group they receive Long Term Support. These deploy using the Metal-as-a-Service app. There are some additional components that now allow somewhat incredible scale-out potential for Ubuntu server instances, like those seen in the public cloud at Amazon Web Services, Joyent, Rackspace, and others that employ OpenStack. There are updates to several key packages. Ubuntu 14.04 supports via LTS, Apache Tomcat v7, Postgresql v9.3, Qemu 2.0, Libvirt v1.2, LXC v1, and MySQL v5.5.