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

[Julian Andres Klode]

This doesn't make sense on arm64 because UEFI grub embeds the font and doesn't load external ones when secure booting; so you might want to restrict that to amd64 or give it up and not care about BIOS.
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/450399
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