What sources are used for stage-packages?

[niemeyer]

I don’t think there’s a way to do that on snapcraft.yaml itself yet. See this topic for details:

Proposal: additional package sources

When a user wishes to include packages from a PPA or alternative repository it is currently not easy, and certainly not obvious how to add the repository. Some developers are likely to expect that they can add a PPA or alternative repository using the prepare step. My proposal is to formalise adding of alternative repositories into a declarative form, rather than relying on scriptlets. I suggest we add a top-level stanza as follows: apps: command: blah repositories: my-ppa: keys: …