创建虚拟网络时出错：error creating bridge interface virbr0: Operation not permitted
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/createnet.py", line 811, in _async_net_create
net.install()
File "/usr/share/virt-manager/virtinst/network.py", line 245, in install
net.create()
File "/usr/lib/python3/dist-packages/libvirt.py", line 2996, in create
if ret == -1: raise libvirtError ('virNetworkCreate() failed', net=self)
libvirt.libvirtError: error creating bridge interface virbr0: Operation not permitted