According to the upstream (see the bug report mentioned in the previous comment) it's not a bug in libvirt but in qemu so I have added qemu to affected packages.
** Also affects: libvirt via https://bugzilla.redhat.com/show_bug.cgi?id=1202453 Importance: Unknown Status: Unknown ** Also affects: qemu (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to libvirt in Ubuntu. https://bugs.launchpad.net/bugs/1432630 Title: libvirt tunnelled migration fails with "migration job: unexpectedly failed" To manage notifications about this bug go to: https://bugs.launchpad.net/libvirt/+bug/1432630/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
