我尝试在我的 Ubuntu 18.04 上连接 USB 华为 E8372 调制解调器。dmesg命令给出一个信息：
[ 371.616615] cdc_ether 1-6:1.0 eth0: register 'cdc_ether' at usb-0000:00:14.0-6, CDC Ethernet Device, 0c:5b:8f:27:9a:64
[ 371.616948] usb-storage 1-6:1.2: USB Mass Storage device detected
[ 371.617603] scsi host4: usb-storage 1-6:1.2
[ 371.625478] cdc_ether 1-6:1.0 enx0c5b8f279a64: renamed from eth0
[ 372.636698] scsi 4:0:0:0: Direct-Access HUAWEI TF CARD Storage 2.31 PQ: 0 ANSI: 2
[ 372.637021] sd 4:0:0:0: Attached scsi generic sg2 type 0
[ 372.637270] sd 4:0:0:0: Power-on or device reset occurred
[ 372.637965] sd 4:0:0:0: [sdc] Attached SCSI removable disk
[ 372.856712] usbcore: registered new interface driver usbserial_generic
[ 372.856727] usbserial: USB Serial support registered for generic
[ 372.860310] usbcore: registered new interface driver option
[ 372.860325] usbserial: USB Serial support registered for GSM modem (1-port)
所以我有enx0c5b8f279a64接口。network-manager 服务添加此设备（来自 的日志service network-manager status）：
[1561201979.1919] devices added (path: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-6/1-6:1.0/net/enx0c5b8f279a64, iface: enx0c5b8f279a64)
[1561201979.1919] device added (path: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-6/1-6:1.0/net/enx0c5b8f279a64, iface: enx0c5b8f279a64)
但我无法访问互联网。而且，ifconfig没有显示这个界面。
我可以使用dhclient :
dhclient -v enx0c5b8f279a64:
Listening on LPF/enx0c5b8f279a64/0c:5b:8f:27:9a:64
Sending on LPF/enx0c5b8f279a64/0c:5b:8f:27:9a:64
Sending on Socket/fallback
DHCPREQUEST of 192.168.8.100 on enx0c5b8f279a64 to 255.255.255.255 port 67 (xid=0x36f4d377)
DHCPNAK from 192.168.8.1 (xid=0x77d3f436)
DHCPDISCOVER on enx0c5b8f279a64 to 255.255.255.255 port 67 interval 3 (xid=0x5ad85374)
DHCPDISCOVER on enx0c5b8f279a64 to 255.255.255.255 port 67 interval 7 (xid=0x5ad85374)
DHCPREQUEST of 192.168.8.100 on enx0c5b8f279a64 to 255.255.255.255 port 67 (xid=0x7453d85a)
DHCPOFFER of 192.168.8.100 from 192.168.8.1
DHCPACK of 192.168.8.100 from 192.168.8.1
bound to 192.168.8.100 -- renewal in 41121 seconds.
之后，我将访问 Internet，以及 network-manager 日志：
[1561202049.0339] device (enx0c5b8f279a64): carrier: link connected
[1561202049.0415] device (enx0c5b8f279a64): carrier: link connected
我希望网络管理器服务自动设置调制解调器的接口，而不需要像运行dhclient这样的任何手动步骤。怎么做？
谢谢。