[Merge] ~dbungert/livecd-rootfs:debootstrap-debug into livecd-rootfs:ubuntu/master

[Steve Langasek]

Review: Approve

YES PLEASE

(I have been unable to locally reproduce the most recent bootstrap failures from the livefs builds!)
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https://code.launchpad.net/~dbungert/livecd-rootfs/+git/livecd-rootfs/+merge/463442
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