Charlie McMackin, when in initramfs can you mount it via:
mount -o remount,rw /root

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https://bugs.launchpad.net/bugs/1568429

Title:
  1002:68b8 Radeon won't work with KMS enabled

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  After upgrading to Xenial today and ensuring the xorg radeon driver
  was enabled, when booting both monitor lose signal input and the
  keyboard becomes unresponsive.

  My hardware:
  02:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. 
[AMD/ATI] Juniper XT [Radeon HD 5770] [1002:68b8] (prog-if 00 [VGA controller])
        Subsystem: XFX Pine Group Inc. Juniper XT [Radeon HD 5770] [1682:2990]

  WORKAROUND: Use one of the following kernel parameters:
  nomodeset
  radeon.modeset=0

  The machine will boot but the radeon driver will not load. Attempting
  to load radeon driver with `sudo modprobe radeon modeset=1` after
  booting with modesetting off results in the same fail state explained
  above.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  .tmp.unity.support.test.1:

  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,grid,mousepoll,widget,regex,vpswitch,resize,imgpng,place,gnomecompat,wall,move,animation,fade,snap,expo,scale,unitymtgrabhandles,ezoom,session,workarounds]
  CompositorRunning: None
  Date: Sat Apr  9 20:02:22 2016
  DistUpgraded: 2016-04-09 16:49:55,340 ERROR got error from PostInstallScript 
./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process 
"./xorg_fix_proprietary.py" (No such file or directory) (8))
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   vboxhost, 5.0.12, 4.2.0-35-generic, x86_64: installed
   vboxhost, 5.0.12, 4.4.0-18-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Continuously
  GpuHangReproducibility: Yes, I can easily reproduce it
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Juniper XT [Radeon HD 5770] 
[1002:68b8] (prog-if 00 [VGA controller])
     Subsystem: XFX Pine Group Inc. Juniper XT [Radeon HD 5770] [1682:2990]
  InstallationDate: Installed on 2013-12-29 (832 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 
(20131016.1)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-18-generic 
root=UUID=e7310b2e-03b9-4e94-ba8a-d384330592cf ro quiet splash radeon.modeset=0
  Renderer: Software
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: Upgraded to xenial on 2016-04-09 (0 days ago)
  dmi.bios.date: 04/29/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0519
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P5N7A-VM
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0519:bd04/29/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5N7A-VM:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz 1:0.9.12.2+16.04.20160331-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Sat Apr  9 19:49:46 2016
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.18.3-1ubuntu2

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