[Merge] ~utkarsh/livecd-rootfs/+git/livecd-rootfs:use-lxd-installer-lunar into livecd-rootfs:ubuntu/lunar

[Utkarsh Gupta]

I've ran more tests and can confirm that it works as expected. The diff also comes out to be the same as expected.
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https://code.launchpad.net/~utkarsh/livecd-rootfs/+git/livecd-rootfs/+merge/458437
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