[server] Ubuntu Server 16.04 Beta 2 + VirtualBox 5.0.16 = no bridged network settings

I'm trying to run VirtualBox on a headless whitebox running Ubuntu Server, but there's one thing which has stumped me - the lack of bridged network settings under Preferences/Network. The only tabs available are 'NAT Networks' and 'Host-only Networks'.


Have I missed some configuration?