[Merge] ~vorlon/livecd-rootfs:lp.2034299 into livecd-rootfs:ubuntu/master

[Steve Langasek]

> But is this a workaround?

On principle, we should not fail an image build due to a failure in a call that is done only for debugging purposes; that makes the system more brittle without providing additional value.

It does not address the root cause of why the blkid call is failing, but we don't currently know why it's failing.
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https://code.launchpad.net/~vorlon/livecd-rootfs/+git/livecd-rootfs/+merge/450731
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