全新系统，启动后，启动Linux子系统，提示告知无法启动虚拟机。
/var/log/message内容如下：
2019-10-10T07:24:34.857825+00:00 INFO permission_broker[1347]: ProcessPath(/dev/bus/usb/001/013) 2019-10-10T07:24:35.036921+00:00 INFO permission_broker[1347]: AllowUsbDeviceRule: ALLOW 2019-10-10T07:24:35.037054+00:00 INFO permission_broker[1347]: AllowTtyDeviceRule: IGNORE 2019-10-10T07:24:35.270619+00:00 INFO permission_broker[1347]: DenyClaimedUsbDeviceRule: DENY 2019-10-10T07:24:35.270797+00:00 INFO permission_broker[1347]: Verdict for /dev/bus/usb/001/013: DENY 2019-10-10T07:24:40.872090+00:00 ERR cras_server[1491]: Unable to find the best channel map
2019-10-10T07:25:00.087378+00:00 INFO vm_concierge[5960]: Received CreateDiskImage request 2019-10-10T07:25:00.087610+00:00 INFO vm_concierge[5960]: Found existing disk at /home/root/621f402f63e95f7b124f180fe6786fd22de903aa/crosvm/dGVybWluYQ==.img with current size 101253541478 and usage 4096 2019-10-10T07:25:00.088862+00:00 INFO vm_concierge[5960]: Received StartVm request 2019-10-10T07:25:00.089003+00:00 ERR vm_concierge[5960]: Missing VM kernel path: /run/imageloader/cros-termina/99999.0.0/vm_kernel