17.04 is working mostly out of the box for me, at least using a sata ssd.
4k 60hz using the hdmi2.0 port
connection a thunderbolt3 disk or raid
No problems with windows 10 on an nvme ssd ( very speedy using the samsung driver ).
This message was posted on behalf of Intel Corporation
Thank you for contacting the Intel community.
I’m really sorry that you couldn’t install Ubuntu on this specific NUC and that you decided to return it.
We were able to install Ubuntu 17.04 without problem; however, Intel hasn't validated these operating systems. We recommend you use the latest kernel. If you need assistance with Linux* on Intel NUC, check your distro's website and forums for peer assistance.
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Installed Ubuntu 16.04.2 and 17.04. Same result, no sound. Installed Linux Mint 18.1. Got sound for a while, but after reboot, it was gone. Followed all Intel and Ubuntu community instructions to resolve no sound, but, no sound. I have had a lot of problems with new hardware and Linux. I actually ran my office on CP/M, so I am not intimidated by install problems, but I will simply wait for Linux to catch up with the hardware. I am hoping for good things from Intel Thunderbolt3 later this year.
We've been running various NUCs on various Linux distros in prototyping since early 2015, and it was not the NUCs fault we finally ditched Linux for Windows...