Time marches on; Kubuntu 19.10 has reached the end of its life. Best to upgrade to 20.04 (a Long-Term Support release!) now if you haven't already. If you can't update quite yet, don't worry, it will still be possible even once the packages are archived. See https://kubuntu.org/news/kubuntu-19-10-eoan-ermine-reaches-end-of-life/ for more details.
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