Kubuntu 20.04.4 is out now, notably updating the Hardware Enablement Stack. If everything is working fine for your existing 20.04 LTS installs, nothing to worry about, but if you have newer hardware that hasn't quite been supported by the LTS release, now might be the time for you!
(And of course the next LTS, 22.04, is just around the corner in April, for those who like sticking to Long-Term Support releases but are starting to itch for things shiny and new :))
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