我根据这个指南安装了QEMU-KVM和Virt-manager：https://linuxconfig.org/install-and-set-up-kvm-on-ubuntu-18-04-bionic-beaver-linux。
在创建新的虚拟机时，我可以进行到第4步，但无法继续。
在创建新的虚拟机时，我可以进行到第4步，但无法继续。
Uncaught error validating install parameters: Requested operation is not valid: storage pool 'default' is not active
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/create.py", line 1902, in _validate
return self._validate_storage_page()
File "/usr/share/virt-manager/virtManager/create.py", line 2218, in _validate_storage_page
self._guest.name, do_log=True)
File "/usr/share/virt-manager/virtManager/create.py", line 2210, in _get_storage_path
path = self._addstorage.get_default_path(vmname)
File "/usr/share/virt-manager/virtManager/addstorage.py", line 235, in get_default_path
suffix=suffix, collidelist=newcollidelist)
File "/usr/share/virt-manager/virtinst/storage.py", line 588, in find_free_name
pool_object.refresh(0)
File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3229, in refresh
if ret == -1: raise libvirtError ('virStoragePoolRefresh() failed', pool=self)
libvirtError: Requested operation is not valid: storage pool 'default' is not active