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there must be a matching Ubuntu version for any given Devuan distribution version, that has the crucial libraries should be in the same place, right? If so, a Launchpad PPA with custom packages based on the Devuan packaging metadata (the `debian` subdir) ought not be too risky?
Yes, the packaging is the same, so libraries all go to the same places in debian, devuan and ubuntu. But ubuntu is based on debian sid, not debian testing after freeze, so library versions might not correspond between comparable releases of ubuntu and either debian or devuan. YMMV.
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