[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:netboot-fixes into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Michael Hudson-Doyle has proposed merging ~mwhudson/livecd-rootfs/+git/livecd-rootfs:netboot-fixes into livecd-rootfs:ubuntu/master.

Commit message:
 livecd-rootfs (2.769) UNRELEASED; urgency=medium
 .
   * Fix some issues with the netboot tarballs:
     - Include the signed shim (oops).
     - Make the kernel path on disk and in the bootloader config match (more
       oops).
     - Make paths more architecture dependent as the code in grubnetXXX.efi to
       probe a platform dependent path first doesn't work.


Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/426680

The original idea for netboot tarballs was that you could unpack them all at the root of a tftp server, use dchp to point a netbooting machine at them and rely on differences in the bootloaders to mostly find the right config for a given boot-style. But this doesn't work in practice (see https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1981378) so this goes to the other extreme and puts everything into arch-dependent subdirectories. But if we do that, maybe it makes sense for the netboot tarball to just have everything at the root and let the user put them in to an arch-dependent subdir if they want/need? I guess leaving it like this allows us to move back to the previous model if we fix grub.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~mwhudson/livecd-rootfs/+git/livecd-rootfs:netboot-fixes into livecd-rootfs:ubuntu/master.
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