[Merge] ~utkarsh/livecd-rootfs/+git/livecd-rootfs:install-lxd-from-diff-channel into livecd-rootfs:ubuntu/master

[Utkarsh Gupta]

Henlo Steve,

I was waiting for that, hah. Anyway, lsb_release is being used quite a lot.

See https://git.launchpad.net/livecd-rootfs/tree/live-build/auto/build#n458 and the new two lines. But anyway, is there an alternative you'd propose?
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https://code.launchpad.net/~utkarsh/livecd-rootfs/+git/livecd-rootfs/+merge/451786
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