@Laszlo - darn, no luck. Following your recommendations, PXE booting is
no longer attempted, but I still end up at Shell> and the installer
doesn't launch.

I'm attaching the isolated test script I'm using ATM. If I try it with
the latest Yakkety desktop daily ISO, I hit the above hardware exception
(as expected because of the issue in `shim`). However, if I try it with
the same ISO modified to include /EFI/BOOT/fallback.efi, it goes
directly to Shell> rather than launching the installer.

Please let me know if you spot any goofs in my script or can think of
anything else to try.

(Note: my test script doesn't have any -net devices at all, but my image
mastering tools do, so that's why I know that PXE booting wasn't being
tried any more.)

@Mathieu - under the assumption that there is more to this than just the
issue in `shim`, or at least that the presence of fallback.efi can't
fully work-around it, do you have any suggestions as to where I should
go looking for other things that have changed between the Yakkety and
Xenial ISOs, things that might be interacting with the `shim` bug in odd
ways?

Also, I should make it clear why this bug is critical to System76: our
imaging mastering tools use QEMU + OVMF to create our UEFI images, so
this is something we absolutely need to find some solution for in order
to ship 16.10. Because (most likely) we'll need 16.10 to initially ship
Kaby Lake :D

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https://bugs.launchpad.net/bugs/1624096

Title:
  yakkety: backport (or rebase to) fix eliminating a double-close in
  shim

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