I had to use "virsh edit <domain>" to manually add an <address> specifier thus:
$ virsh dumpxml Kubuntu14.04 --- 8-< snip --- <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x8564'/> <product id='0x1000'/> <address bus='2' device='7'/> </source> <alias name='hostdev0'/> </hostdev> --- 8-< snip --- ** Attachment added: "USB Host Device after adding <address> specifier" https://bugs.launchpad.net/ubuntu/+source/virt-manager/+bug/1489175/+attachment/4452986/+files/vm-usb-device.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1489175 Title: VM fails to start with host USB device attached when multiple identical Vendor:Product IDs exist To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virt-manager/+bug/1489175/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs