Created attachment 1485352 [details] Screenshot of error. Description of problem: When working on a system that has two NIC with a naming standard (such as enp1s0f0 and enp1s0f1), it always checks the first interface even is the second is selected. This only impacts the "Virtual Network" area and does not appear to impact the "Network Interfaces". How reproducible: Every time. Steps to Reproduce: 1.Have a system with stated naming standard for NICs. 2.Try to create a virtual network using the second device while the first it in use. See the attachment, notice that the interface selected on the first screen does not match the interface in the error.
Version: virt-manager/bionic,bionic,now 1:1.5.1-0ubuntu1 all [installed]
Thanks for the report. I think what that error is refering to is that the selected network address is already in use by another virtual network. So for example you specified <ip address='192.168.124.1'> which is already used by another <network> definition. It isn't related to interface naming. The libvirt error could be clearer and virt-manager could try and ensure we don't default to any conflicting network addresses, but it's not due to any naming mixup