Listen up, Kubuntu: the enraging tale of sound over HDMI

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I live with Kayla, and had to jump in to help resolve an enraging problem we ran into on the Kubuntu installation with KDE, PulseAudio and the undesirable experience of not having sound in applications. It involved a fair bit of terminal work and investigation, plus a minimal understanding of how sound works on Linux. TuxRadar has a good article that tries to explain things. When there are problems, though, the diagram looks much more like the (admittedly outdated) 2007 version:

rest here