[Merge] ~xnox/livecd-rootfs:fix-x13s-try2 into livecd-rootfs:ubuntu/master

[Dimitri John Ledkov]

kernel remains in the live layer https://launchpadlibrarian.net/689553891/livecd.ubuntu.minimal.standard.live.manifest as expected.
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https://code.launchpad.net/~xnox/livecd-rootfs/+git/livecd-rootfs/+merge/452427
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