[Merge] livecd-rootfs:focal-iotg-bump into livecd-rootfs:ubuntu/focal

[Łukasz Zemczak]

Thank you Michael! Yes, basically both branches are actually in use - I created some test images for them using packages from a PPA (as those are alpha images just for testing). Wanted to get the changes official so that consecutive images do not need any extra-ppas.
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https://code.launchpad.net/~ubuntu-core-dev/livecd-rootfs/+git/livecd-rootfs/+merge/424368
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