[Merge] ~toabctl/livecd-rootfs:master-replace-apt-key-lp#1948929 into livecd-rootfs:ubuntu/master

[Utkarsh Gupta]

> It's not urgent - it should be merged before Jammy release
> and earlier is better because the CPC team can then build
> all the daily images with that change (to catch possible
> bugs quickly).

Right, but we have a good amount of time in hand before that so I believe we can include a couple of more bug fixes for the next upload. This way we way more quality uploads, I believe. :)

> Should I change the debian/changelog version to UNRELEASED
> for now?

Yep, that'd be ideal, thank you!
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https://code.launchpad.net/~toabctl/livecd-rootfs/+git/livecd-rootfs-1/+merge/410866
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