I couldn't find it on Dell's generally available web shop, but in the punchout shop I get from Dell via my employer, it is possible to configure Latitudes with

I couldn't find it on Dell's generally available web shop, but in the punchout shop I get from Dell via my employer, it is possible to configure Latitudes with Ubuntu 16.04. A colleague recently got a Latitude 5480 with Ubuntu 16.04 that way.