[Merge] ~powersj/livecd-rootfs:xenial-grub-add-signed into livecd-rootfs:ubuntu/xenial

[Robert C Jennings]

Review: Needs Fixing

The commit message needs a bug reference
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https://code.launchpad.net/~powersj/livecd-rootfs/+git/livecd-rootfs-1/+merge/394769
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~powersj/livecd-rootfs:xenial-grub-add-signed into livecd-rootfs:ubuntu/xenial.