The constraint comes from the "pyasn1-modules" pkg which seems to have been pre-installed on your system, I cannot find it being installed during your stack.sh.log, but recent versions of it seem to require pyasn1>=0.4.6, while the stable/stein reqs cap pyasn1 at 0.4.5. So you need to check your machine for why this gets installed. It should not happen on a fresh instance.
** Changed in: ubuntu Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1849815 Title: Devstack-Stein deployment fails w/ pyasn1 ContextualVersionConflict error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1849815/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs