Error: 「default」:internal error: Failed to initialize a valid firewall backend

Error: 「default」:internal error: Failed to initialize a valid firewall backend

我在我的 virt-manager 中创建了一个 Windows10 虚拟机。 但是,它是这样说的:

「default」:internal error: Failed to initialize a valid firewall backend

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/netlist.py", line 364, in validate_network
    netobj.start()
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 82, in newfn
    ret = fn(self, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/network.py", line 81, in start
    self._backend.create()
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 2892, in create
    if ret == -1: raise libvirtError ('virNetworkCreate() failed', net=self)
libvirtError: internal error: Failed to initialize a valid firewall backend

怎么办?

安装这个:

sudo apt install uml-utilities