Dear all, I think I have found the cause for this issue. Apparently some arch:all binary packages are not listed in both the binary-<arch>/Packages.* and binary-all/Packages.* file groups, but ONLY in the binary-all/Packages.* files (at least on unstable). The britney log tells me that the binary-all files are not read in yet.
Currently the source package bzr is in this position (and I noticed because autopkgtest fails on non-installability of the arch:all packages), which enabled me to figure this out. I don't know yet what the proper solution is, but adding the "all" architecture is fixing my test case, albeit I expect that to introduce different issues. I've added a test case for this issue in britney2-tests/t/bug-887060-ftbfs-on-all Paul
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