[Merge] ~vhaudiquet/livecd-rootfs:riscv-netboot into livecd-rootfs:ubuntu/master

[Valentin Haudiquet]

I don't think I know how or if it is possible to run livecd-rootfs manually, so I could not test my changes... but they are minimal.

If someone can tell me how to test locally, that would be awesome :)

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https://code.launchpad.net/~vhaudiquet/livecd-rootfs/+git/livecd-rootfs/+merge/496379
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