Comment 11 for bug 1819427

OK, unless anybody comes up with evidence to the contrary, I'm going to say that what was happening was this:

Some isos have gone out with snaps that had `base: core18`, but without seeding `core18`. This is not supported, and will cause seeding to hang.

Unless somebody can positively point to this happening on an iso that _didn't_ have these wrongly-seeded snaps, or conversely have it not happen when the core18-based snaps were seeded, that's all there was to it.

It's been harder to debug than would've been ideal because there has been some confusion around which isos people were testing.

HTH, HAND.