Can not install 'openjdk-9-jdk' because it tries to overwrite file aready included in 'openjdk-9-jdk-headless'

I'm running Ubuntu 16.04 Xenial desktop, 64 bit, and wanted to install openjdk-9-jdk (Java 9 development kit). The version available from the universe repository is 9~b114-0ubuntu1. Running the