I have a clean install of Ubuntu 14.04, installed the Ubuntu SDK, and created an app from the "HTML5 App" template.
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The instructions for installing the SDK tell you to add the ubuntu-sdk-team/ppa PPA. However, it seems that some updates from the phablet-team/tools PPA are also required for it to work correctly. Running
sudo apt-add-repository ppa:phablet-team/tools sudo apt-get update sudo apt-get upgrade
made the UI of the Publish and Devices tabs appear, and allowed me to create an emulator.