I found it, the reason this still failed is that the backing file had the new option as well. That was on a shared storage and synced on trusty before.
So "inside" an "only precise" scope -> no-bug. Given the time precise will still be around and this only being an ppa I think we can keep it as wont fix. The LP bug might serve anyone else running into it as a helper to understand what is going on. ** Changed in: uvtool (Ubuntu) Status: New => Won't Fix ** Changed in: uvtool (Ubuntu) Importance: Undecided => Low -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1620633 Title: qcow image created in precise is not usable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/uvtool/+bug/1620633/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs