After discussion on IRC (#debian-devel) I filed Debian bug 896506¹ about this failing command.
I'll continue to pursue a solution in this area. Maybe (suggested by josch): --solver aspcud -o APT::Solver::Strict-Pinning=false -o 'APT::Solver::aspcud::Preferences=-removed,-changed,-new,count(solution,APT-Release:=/a=$unstable/)' ¹ https://bugs.debian.org/896506 ** Bug watch added: Debian Bug tracker #896506 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=896506 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1760810 Title: Non-pinned available package in -proposed not chosen To manage notifications about this bug go to: https://bugs.launchpad.net/auto-package-testing/+bug/1760810/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs