[Merge] ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/ubuntu-cpc-LP-2037075-efibootmgr into livecd-rootfs:ubuntu/master

[Philip Roche]

@vorlon now superseded by https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/452152 

Can you mark this MP as rejected? I do not have the permission to do so. 
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https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/451891
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