I think from you description you can install this system from the new
ISO using hdmi.  Would you therefore be able to check out some of the
interim kernels between 4.12.0-12 and 4.13.0-16 to see which of those
work.  They should be available in the launchpad librarian.  Don't
forget to install both linux-image and linux-image-extra when testing.

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https://bugs.launchpad.net/bugs/1723619

Title:
  Ubuntu Desktop ISO fails to boot with nouveau on a displayport

Status in Release Notes for Ubuntu:
  New
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On the latest daily artful image (/current as of 2017-01-14), the
  following occurs on a system with nVidia graphics (on my system, a
  GTX970) when connected to a 4k display over a displayport:
  https://photos.app.goo.gl/gLUva3Vgvtv0lAmj2

  Steps to reproduce:
  - Download latest daily image, check checksums, burn to USB
  - Boot from USB.
  - Choose "Install Ubuntu" or "try ubuntu" at the menu.

  This happens on the livecd, but also upon ugrading the system from a
  previous daily with a different kernel: my "old" daily booted and
  installed fine with kernel 4.12.0-12, then failed with same error once
  dist-upgraded.

  On the faulty system I could test with, it seems to *only* happen over
  displayport/on a 4k screen (I don't own a non-4k displayport screen to
  test the 4k out).

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