Michal and I debugged this over IRC, and tracked it down. He had an /etc/apt/apt.conf with explicitly setting Architecture:, and creating an apt.Cache(rootdir="...") object still takes that global configuration into account.
The attached test as ** Summary changed: - Retracing armhf doesn't work on amd64 + creating apt cache with rootdir= still considers global apt config ** Package changed: apport (Ubuntu) => python-apt (Ubuntu) ** Changed in: python-apt (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1238616 Title: creating apt cache with rootdir= still considers global apt config To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/1238616/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs