我用华为E220摇杆在Jetson Nano上建立到T-Mobile的蜂窝连接时遇到麻烦。它曾经能够连接，但现在不再连接。 PIN被禁用，并且在Windows下摇杆正常工作。我认为这可能与Ubuntu Modem Manager将棍子错误标识为E176的事实有关。
请告知。
p:~$ lsusb | grep Huawei
Bus 001 Device 005: ID 12d1:1003 Huawei Technologies Co., Ltd. E220 HSDPA Modem / E230/E270/E870 HSDPA/HSUPA Modem
p:~$ mmcli -L
/org/freedesktop/ModemManager1/Modem/0 [huawei] E176
p:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic
p:~$ nmcli d
DEVICE TYPE STATE CONNECTION
eth0 ethernet connected Wired connection 1
l4tbr0 bridge connected l4tbr0
ttyUSB1 gsm connecting (prepare) T-Mo
dummy0 dummy unmanaged --
rndis0 ethernet unmanaged --
usb0 ethernet unmanaged --
lo loopback unmanaged --
经过几次神秘的连接/断开后，我在Nano和调制解调器之间插入了USB延长线！现在，连接非常可靠。没关系，您在连接图标中看到多少行，如果激活失败并在日志中显示以下消息，则可能会出现接收问题：
$ sudo journalctl -fu NetworkManager
-- Logs begin at Fri 2019-10-25 12:49:30 CEST. --
okt 25 12:53:54 jerry-desktop NetworkManager[3947]: <info> [1572000834.4694] device (ttyUSB1): Activation: starting connection 'T-Mobile Default' (94e66a1c-baa3-4d94-b439-80ca55d26735)
okt 25 12:53:54 jerry-desktop NetworkManager[3947]: <info> [1572000834.4705] device (ttyUSB1): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
okt 25 12:55:04 jerry-desktop NetworkManager[3947]: <info> [1572000904.4144] connectivity: (l4tbr0) timed out
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <warn> [1572000960.4562] modem-broadband[ttyUSB1]: failed to connect modem: Network timeout
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info> [1572000960.4566] device (ttyUSB1): state change: prepare -> failed (reason 'gsm-registration-timeout', sys-iface-state: 'managed')
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <warn> [1572000960.4600] device (ttyUSB1): Activation: failed for connection 'T-Mobile Default'
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info> [1572000960.4627] device (ttyUSB1): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info> [1572000960.4649] policy: auto-activating connection 'T-Mobile Default'
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info> [1572000960.4679] device (ttyUSB1): Activation: starting connection 'T-Mobile Default' (94e66a1c-baa3-4d94-b439-80ca55d26735)
okt 25 12:56:00 jerry-desktop NetworkManager[3947]: <info> [1572000960.4690] device (ttyUSB1): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
okt 25 12:58:06 jerry-desktop NetworkManager[3947]: <warn> [1572001086.4517] modem-broadband[ttyUSB1]: failed to connect modem: Network timeout