We're talking about the live/install media... throwing the image on a
USB drive and booting it, for trialling or installing the OS.

I have not tried the 16.04 (not .1) media. However, I wouldn't expect
different results.

...How would I install an alternate kernel on the live image?

In the installed system, using the linux-image-generic-hwe-16.04-edge
kernel shows improvement (removes the need for nomodeset and allows X to
enumerate and configure the card's outputs) but doesn't completely fix
the issue. To get hardware acceleration, it's necessary to install
libgl1-mesa-dri >=11.3 which isn't available from the official
repositories.

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https://bugs.launchpad.net/bugs/1659075

Title:
  Live media lacks functioning driver for AMD Polaris GPUs, resulting in
  X failing to start and unusable text console

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  The text console flickers, and ignores most keyboard input.

  This can be worked around by adding nomodeset to the kernel command
  line, which will make X fall back on the VESA driver, with all the
  limitations inherent to that.

  The resulting installed system will have the same problem, which can
  alternately be worked around by installing linux-image-generic-
  hwe-16.04-edge, but this only partially fixes the problem. The Mesa
  radeonsi driver in Xenial is too old for these GPUs, so while
  modesetting and display configuration will now be functional, the
  system will still entirely lack graphics acceleration. The only
  workarounds I know of for this is to source a newer Mesa from a PPA or
  similar, or install AMD's proprietary drivers.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-generic 4.4.0.31.33
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  ubuntu-gnome   4365 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu-gnome   4365 F.... pulseaudio
  CasperVersion: 1.376
  Date: Tue Jan 24 18:25:03 2017
  IwConfig:
   lo        no wireless extensions.
   
   enp3s0    no wireless extensions.
  LiveMediaBuild: Ubuntu-GNOME 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160720)
  MachineType: ASUS All Series
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: file=/cdrom/preseed/hostname.seed boot=casper 
cdrom-detect/try-usb=true noprompt floppy.allowed_drive_mask=0 ignore_uuid 
initrd=/casper/initrd.lz quiet splash nomodeset BOOT_IMAGE=/casper/vmlinuz.efi
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-31-generic N/A
   linux-backports-modules-4.4.0-31-generic  N/A
   linux-firmware                            1.157.2
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/07/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2004
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H87M-E
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2004:bd08/07/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH87M-E:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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