Thanks for the reply.  Well, if I'm not getting any video I'm not sure
how I could get SSH setup but I do have something interesting to report.
When I boot the live DVD, leave the "set gfxpayload=keep" setting alone,
and remove "quiet splash" from the kernel parameters, I can get the
system to boot.  How?  I'm not sure.  I wait for there to be no sound
from the optical drive, which tells me the system has completed its
internal boot process.  Then I start pressing Ctrl-Alt-F1 through F12,
trying to switch from X terminal sessions to a text-mode login session
and eventually, I'll get a video signal, along with the desktop on the
terminal I get from Ctrl-Alt-F7 (tty 7).  So, perhaps I'm triggering
something by doing this, I'm not sure.

However, I do have a dmesg log generated *without* specifying
"nomodeset".

Now, something else worth mentioning.  I have the system setup to *not*
boot in UEFI mode, because I had problems with Ubuntu 13.04 (my first
Ubuntu release) booting in UEFI mode.  So, I disabled secure boot and
enabled the "Legacy CSM" and the system boots reliably from the hard
drive.   When I boot the Ubuntu 16.04 live DVD in non-UEFI mode, I never
get a chance to specify the kernel parameters.  When I boot the live DVD
in UEFI mode, I get a chance to specify the kernel parameters.

Thanks!

** Attachment added: "dmesg log from boot without "nomodeset" specified"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1598935/+attachment/4695585/+files/dmesg-3.log

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https://bugs.launchpad.net/bugs/1598935

Title:
  Ubuntu 16.04 won't properly boot due to radeon module issue

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