Comment 61 for bug 811441

I have the same problem and #24 doesnt resolve the issue for me: I am running a virtual machine based on KVM and bridged networking. And the network bridge doesnt come up any more. Therefore I cannot run the virtual machine any more. This is the output from virsh:

error: Failed to start domain vm
error: Failed to add tap interface to bridge 'br0': No such device

If I try to configure the bridge in /etc/network/interfaces the system disconnects completely. Can anybody help?