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What's the best easy KDE-based Linux distro these days?
(kbin.social)
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Kubuntu is fine if you don't mind the direction that Canonicla is heading.
Moving from Ubuntu to a debian based distro makes sense - a lot of stuff is familliar. Base debian is fine, but MX is a little more friendly. They have a KDE image here: https://mxlinux.org/download-links/