I should add that while fiddling around today I found the snapcraft site here:

snapcraft.io/install/kstars/debian

and was able to install snap and then stars, and then run it from /snap/bin with ./kstars though the latest stable release there is 3.6.6. So I've got some independence but can only go backwards there at the moment. Anybody know how to trigger snap to provide the latest stable and beta under their their stable and candidate channels?

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