apport-collect will give me the same output as ubuntu-bug, namely that I am not 
running an Ubuntu kernel and refuse to do anything else.
The official 16.04 kernel will only produce a black screen.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1651910

Title:
  radeon: black screen after upgrade from 14.04 to 16.04 on RS780

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After upgrading from Ubuntu 14.04 to 16.04, the screen will stay black
  after GRUB (backlight is on) when booting with the new 4.4 kernel
  (linux-image-4.4.0-57-generic).  Booting with the old 3.14 kernel will
  make the screen work again.

  This is on a BIOSTAR A780L mainboard, with the monitor connected via
  DVI.

  "ubuntu-bug linux" tells me that I appear to run a mainline kernel and
  cannot report anything (obviously, as the screen doesn't work if I
  boot the 16.04 kernel).

  $ cat /proc/version_signature > version.log
  cat: /proc/version_signature: No such file or directory

  1) The release of Ubuntu you are using, via 'lsb_release -rd' or
  System -> About Ubuntu

  $ lsb_release -rd
  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04

  2) The version of the package you are using, via 'apt-cache policy
  pkgname' or by checking in Software Center

  $ apt-cache policy linux-image-4.4.0-57-generic
  linux-image-4.4.0-57-generic:
    Installed: 4.4.0-57.78
    Candidate: 4.4.0-57.78
    Version table:
   *** 4.4.0-57.78 500
          500 http://de.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
          100 /var/lib/dpkg/status

  3) What you expected to happen

  Screen doesn't stay black

  4) What happened instead

  Screen stays black
  --- 
  ApportVersion: 2.20.1-0ubuntu2.4
  Architecture: amd64
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  PackageArchitecture: amd64
  Tags:  xenial
  Uname: Linux 3.14.79-031479-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-09-24 (88 days ago)
  UserGroups: adm admin cdrom dialout lpadmin nopasswdlogin plugdev sambashare
  _MarkForUpload: True

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