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WWAN 调制解调器自行禁用，Ubuntu 14.10，联想 T440s，Sierra Wireless EM7345 4G LTE

tag-icon • tag-icon wireless networking 14.10 lenovo wwan
WWAN 调制解调器自行禁用，Ubuntu 14.10，联想 T440s，Sierra Wireless EM7345 4G LTE

我已经使用联想很长一段时间了，并试图寻找解决 WWAN 问题的方法。

我可以通过 GUI 和终端启用 WWAN，并通过我的网络提供商进行连接。但过了一段时间，网络断线了，调制解调器也自行禁用了。我的手机使用的网络和这个网络一样，所以没有问题。

我似乎找不到正确的日志来找出问题所在。所以我希望这里有人可以帮助我或知道在哪里可以找到问题。

我从终端获得了以下输出，我认为这些输出可能会有帮助，所有这些都是在 wwan 连接到网络时发生的：

  1. lsb_release-a：

    分销商 ID：Ubuntu
    描述：Ubuntu 14.10
    发行版：14.10
    代号：utopic

  2. uname -a：

    Linux cbobach-ThinkPad-T440s 3.16.0-031600-generic #201408031935 SMP 2014 年 8 月 3 日星期日 23:36:11 UTC x86_64 x86_64 x86_64 GNU/Linux

  3. USB 设备：

    T：总线=02 级别=01 Prnt=01 端口=03 Cnt=01 设备编号= 7 速度=480 MxCh= 0
    D：版本= 2.00 Cls=ef（杂项）子级=02 协议=01 MxPS=64 #Cfgs= 1
    P：供应商=1199 ProdID=a001 修订版=17.29
    S：制造商=Sierra Wireless Inc.
    S：产品=Sierra Wireless EM7345 4G LTE
    S：序列号=013937001863610
    C：#Ifs= 4 Cfg#= 1 Atr=e0 MxPwr=100mA
    I：If#= 0 Alt= 1 #EPs= 1 Cls=02（通信）子级=0e 协议=00 驱动程序=cdc_mbim
    I：If#= 1 Alt= 2 #EPs= 2 Cls=0a(数据) Sub=00 Prot=02 驱动程序=cdc_mbim
    I：如果#= 2 Alt= 0 #EPs= 1 Cls=02(commc) Sub=02 Prot=01 驱动程序=cdc_acm
    I：如果#= 3 Alt= 0 #EPs= 2 Cls=0a(数据) Sub=00 Prot=00 驱动程序=cdc_acm

  4. nmcli 开发列表：

    GENERAL.DEVICE：cdc-wdm1
    GENERAL.TYPE：gsm
    GENERAL.VENDOR：--
    GENERAL.PRODUCT：--
    GENERAL.DRIVER：cdc_mbim，cdc_acm
    GENERAL.DRIVER-VERSION：
    GENERAL.FIRMWARE-VERSION：
    GENERAL.HWADDR：（未知）
    GENERAL.STATE：100（已连接）
    GENERAL.REASON：0（未给出原因）
    GENERAL.UDI：/org/freedesktop/ModemManager1/Modem/54
    GENERAL.IP-IFACE：wwan0
    GENERAL.NM-MANAGED：是
    GENERAL.AUTOCONNECT：是
    GENERAL.FIRMWARE-MISSING：否
    GENERAL.CONNECTION：/org/freedesktop/NetworkManager/ActiveConnection/15
    CAPABILITIES.CARRIER-DETECT：否
    CAPABILITIES.SPEED：未知
    CONNECTIONS.AVAILABLE-CONNECTION-PATHS：/org/freedesktop/NetworkManager/Settings/{2}
    CONNECTIONS.AVAILABLE-CONNECTIONS[1]：d710afac-2f41-4778-9861-83cc4a272b31 | 3 Bredbånd（标准）
    IP4.ADDRESS[1]：ip = 109.56.85.37/24，gw = 0.0.0.0
    IP4.DNS[1]：95.209.200.69
    IP4.DNS[2]：95.209.200.70

  5. ifconfig：

    wwan0 链路封装：以太网 HWaddr da：5a：85：51：96：5b
    inet addr：109.56.32.124 Bcast：109.56.32.255 掩码：255.255.255.0
    inet6 addr：::d85a：85ff：fe51：965b/64 范围：全局
    inet6 addr：::adf4：9e24：ff95：f33/64 范围：全局 inet6 addr：
    fe80::d85a：85ff：fe51：965b/64 范围：链路
    UP 广播运行 NOARP 多播 MTU：1500 度量：1
    RX 数据包：1 错误：0 丢弃：0 超限：0 帧：0
    TX 数据包：49 错误：0 丢弃：0 超限：0 载波：0
    冲突：0 txqueuelen：1000
    RX字节：88（88.0 B）TX字节：8045（8.0 KB）

  6. 系统日志：

    https://dl.dropboxusercontent.com/u/14778527/syslog

如果您认为有任何内容可以帮助阐明该问题，请写下来。

答案1

我在联想 Thinkpad W541 上的 Ubuntu 14.04 上遇到了同样的问题，该设备配有 Sierra Wireless EM7345 4G LTE，固件为：FIH7160_V1.2_WW_01.1415.07

我在 EM7345 固件 1.1 更新日志中看到，随机断开连接然后无法重新连接的问题已在 1.2 中得到修复。我可以确认该问题在 1.2 中仍然存在，并且没有针对联想 W541 的任何更新。

解决方案是切断集成 Sierra Wireless EM7345 调制解调器（从技术上讲，它是一种 USB 设备）的电源，以强制硬重启。我尝试了所有可能的软重启方法，直到我偶然发现可以在不关闭笔记本电脑的情况下完全切断 USB 端口的电源。

按着这些次序：

1. 使用以下命令找出 Sierra Wireless EM7345 调制解调器的总线路径：

$ lsusb -t

在输出中搜索“cdc”，这是我的：

/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/15p, 480M
    |__ Port 5: Dev 2, If 0, Class=Chip/SmartCard, Driver=usbfs, 12M
    |__ Port 6: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 6: Dev 3, If 1, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 6: Dev 3, If 2, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 7: Dev 4, If 0, Class=Vendor Specific Class, Driver=, 12M
    |__ Port 10: Dev 14, If 0, Class=Communications, Driver=cdc_mbim, 480M
    |__ Port 10: Dev 14, If 1, Class=CDC Data, Driver=cdc_mbim, 480M
    |__ Port 10: Dev 14, If 2, Class=Communications, Driver=cdc_acm, 480M
    |__ Port 10: Dev 14, If 3, Class=CDC Data, Driver=cdc_acm, 480M
    |__ Port 12: Dev 7, If 0, Class=Video, Driver=uvcvideo, 480M
    |__ Port 12: Dev 7, If 1, Class=Video, Driver=uvcvideo, 480M

在这里你可以看到在总线 01 端口 10 中有一个 cdc 设备（Sierra Wireless EM7345 调制解调器），这意味着它的路径是：1-10

2. 将调制解调器送入软重启状态：

$ sudo modem-cmd /dev/ttyACM0 AT+CFUN=16

如果成功则不会有输出。此命令不会自行关闭，因此请按 CTRL+C 将其终止

3. 关闭调制解调器的电源（您需要 root 身份）：

$ echo '1-10' |sudo tee /sys/bus/usb/drivers/usb/unbind

等待几秒钟，直到设备关闭，当 /var/log/syslog 中没有活动时

4. 重新打开调制解调器的电源：

$ echo '1-10' |sudo tee /sys/bus/usb/drivers/usb/bind

此后，调制解调器将需要 1..2 秒才能启动，当系统日志中没有活动时，调制解调器启动完成

5. 在 NetworkManagers 托盘图标右键菜单中勾选启用移动宽带。

6. 像往常一样连接到您选择的移动宽带连接

或者使用这个脚本：

我编写了一个小型 bash 脚本来完成所有这些操作，我使用 gksudo 启动它：

#!/bin/bash
# run this with root!!
# if this doesnt work, check if the bus path is correct with:
# lsusb -t (search for cdc)

modem-cmd /dev/ttyACM0 AT+CFUN=16 &
sleep 1
killall modem-cmd
echo '1-10' |tee /sys/bus/usb/drivers/usb/unbind
sleep 2
echo '1-10' |tee /sys/bus/usb/drivers/usb/bind

附录

以下是我用于 SEO 目的的系统日志：

Every time I suspend my laptop or disconnect the Mobile Broadband connection or when the Mobile Broadband connection dies by itself (happens sometimes):
Also, the modem sometimes disconnects on its own:
Nov  6 02:19:44 L4 avahi-daemon[1075]: Interface wwan0.IPv6 no longer relevant for mDNS.
Nov  6 02:19:44 L4 avahi-daemon[1075]: Leaving mDNS multicast group on interface wwan0.IPv6 with address fe80::d8a3:4fff:fec9:d56e.
Nov  6 02:19:44 L4 avahi-daemon[1075]: Interface wwan0.IPv4 no longer relevant for mDNS.
Nov  6 02:19:44 L4 avahi-daemon[1075]: Leaving mDNS multicast group on interface wwan0.IPv4 with address 10.144.34.75.
Nov  6 02:19:44 L4 kernel: [258309.296360] usb 1-10: USB disconnect, device number 13
Nov  6 02:19:44 L4 kernel: [258309.296416] cdc_mbim 1-10:1.0 wwan0: unregister 'cdc_mbim' usb-0000:00:14.0-10, CDC MBIM
Nov  6 02:19:44 L4 NetworkManager[1024]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/net/wwan0, iface: wwan0)
Nov  6 02:19:44 L4 ModemManager[982]: <info>  (net/wwan0): released by modem /sys/devices/pci0000:00/0000:00:14.0/usb1/1-10
Nov  6 02:19:44 L4 avahi-daemon[1075]: IP_DROP_MEMBERSHIP failed: No such device
Nov  6 02:19:44 L4 avahi-daemon[1075]: Withdrawing address record for fe80::d8a3:4fff:fec9:d56e on wwan0.
Nov  6 02:19:44 L4 avahi-daemon[1075]: Withdrawing address record for 10.144.34.75 on wwan0.
Nov  6 02:19:44 L4 avahi-daemon[1075]: Withdrawing workstation service for wwan0.
Nov  6 02:19:44 L4 ModemManager[982]: [/dev/cdc-wdm0] unexpected port hangup!
Nov  6 02:19:44 L4 ModemManager[982]: <info>  (usbmisc/cdc-wdm0): released by modem /sys/devices/pci0000:00/0000:00:14.0/usb1/1-10
Nov  6 02:19:44 L4 kernel: [258309.319654] cdc_acm 1-10:1.2: failed to set dtr/rts
Nov  6 02:19:44 L4 ModemManager[982]: <info>  (tty/ttyACM0): released by modem /sys/devices/pci0000:00/0000:00:14.0/usb1/1-10
Nov  6 02:19:44 L4 NetworkManager[1024]: <info> (cdc-wdm0): device state change: activated -> unmanaged (reason 'removed') [100 10 36]
Nov  6 02:19:44 L4 NetworkManager[1024]: <info> (cdc-wdm0): deactivating device (reason 'removed') [36]
Nov  6 02:19:44 L4 NetworkManager[1024]: <warn> (12) failed to find interface name for index
Nov  6 02:19:44 L4 NetworkManager[1024]: nm_system_iface_flush_routes: assertion 'iface != NULL' failed
Nov  6 02:19:44 L4 NetworkManager[1024]: <warn> (12) failed to find interface name for index
Nov  6 02:19:44 L4 NetworkManager[1024]: <warn> (12) failed to find interface name for index
Nov  6 02:19:44 L4 NetworkManager[1024]: nm_system_iface_flush_routes: assertion 'iface != NULL' failed
Nov  6 02:19:44 L4 NetworkManager[1024]: <warn> (12) failed to find interface name for index
Nov  6 02:19:44 L4 NetworkManager[1024]: <info> Writing DNS information to /sbin/resolvconf
Nov  6 02:19:44 L4 NetworkManager[1024]: <info> (cdc-wdm0): cleaning up...
Nov  6 02:19:44 L4 NetworkManager[1024]: <info> (cdc-wdm0): taking down device.
Nov  6 02:19:44 L4 NetworkManager[1024]: <info> Unmanaged Device found; state CONNECTED forced. (see http://bugs.launchpad.net/bugs/191889)
Nov  6 02:19:44 L4 dbus[956]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Nov  6 02:19:44 L4 NetworkManager[1024]: <warn> (cdc-wdm0) failed to disconnect modem: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.freedesktop.ModemManager1.Modem.Simple' on object at path /org/freedesktop/ModemManager1/Modem/3
Nov  6 02:19:44 L4 dbus[956]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Nov  6 02:19:44 L4 dbus[956]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Nov  6 02:19:45 L4 kernel: [258309.563672] usb 1-10: new high-speed USB device number 14 using xhci_hcd
Nov  6 02:19:45 L4 kernel: [258309.699555] usb 1-10: New USB device found, idVendor=1199, idProduct=a001
Nov  6 02:19:45 L4 kernel: [258309.699558] usb 1-10: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Nov  6 02:19:45 L4 kernel: [258309.699559] usb 1-10: Product: Sierra Wireless EM7345 4G LTE
Nov  6 02:19:45 L4 kernel: [258309.699560] usb 1-10: Manufacturer: Sierra Wireless Inc.
Nov  6 02:19:45 L4 kernel: [258309.699561] usb 1-10: SerialNumber: 013937005331614
Nov  6 02:19:45 L4 kernel: [258309.720394] cdc_mbim 1-10:1.0: setting rx_max = 16384
Nov  6 02:19:45 L4 kernel: [258309.720903] cdc_mbim 1-10:1.0: cdc-wdm0: USB WDM device
Nov  6 02:19:45 L4 kernel: [258309.721035] cdc_mbim 1-10:1.0 wwan0: register 'cdc_mbim' at usb-0000:00:14.0-10, CDC MBIM, da:a3:4f:c9:d5:6e
Nov  6 02:19:45 L4 kernel: [258309.721963] cdc_acm 1-10:1.2: ttyACM0: USB ACM device
Nov  6 02:19:45 L4 mtp-probe: checking bus 1, device 14: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-10"
Nov  6 02:19:45 L4 mtp-probe: bus: 1, device: 14 was not an MTP device
Nov  6 02:19:45 L4 NetworkManager[1024]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/net/wwan0, iface: wwan0)
Nov  6 02:19:45 L4 NetworkManager[1024]:    SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/net/wwan0, iface: wwan0): no ifupdown configuration found.
Nov  6 02:19:46 L4 ntpd[23035]: Deleting interface #5 wwan0, fe80::d8a3:4fff:fec9:d56e#123, interface stats: received=0, sent=0, dropped=0, active_time=2433 secs
Nov  6 02:19:46 L4 ntpd[23035]: Deleting interface #3 wwan0, 10.144.34.75#123, interface stats: received=144, sent=144, dropped=0, active_time=2433 secs
Nov  6 02:19:46 L4 ntpd[23035]: 91.189.94.4 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: 212.7.1.132 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: 193.40.0.5 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: 5.101.116.20 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: 46.22.223.220 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: peers refreshed
Nov  6 02:19:48 L4 ModemManager[982]: [/dev/cdc-wdm0] Queried max control message size: 512
Nov  6 02:19:48 L4 ModemManager[982]: <info>  Creating modem with plugin 'Generic' and '3' ports
Nov  6 02:19:48 L4 ModemManager[982]: <info>  Modem for device at '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-10' successfully created
Nov  6 02:19:48 L4 ModemManager[982]: [/dev/cdc-wdm0] Queried max control message size: 512
Nov  6 02:19:49 L4 ModemManager[982]: <info>  Modem: state changed (unknown -> disabled)
Nov  6 02:19:49 L4 NetworkManager[1024]: <warn> (cdc-wdm0): failed to look up interface index
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> WWAN now disabled by management service
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): new Broadband device (driver: 'cdc_mbim, cdc_acm' ifindex: 0)
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): exported as /org/freedesktop/NetworkManager/Devices/6
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): deactivating device (reason 'managed') [2]
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> NetworkManager state is now DISCONNECTED
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
Nov  6 02:19:46 L4 ntpd[23035]: Deleting interface #5 wwan0, fe80::d8a3:4fff:fec9:d56e#123, interface stats: received=0, sent=0, dropped=0, active_time=2433 secs
Nov  6 02:19:46 L4 ntpd[23035]: Deleting interface #3 wwan0, 10.144.34.75#123, interface stats: received=144, sent=144, dropped=0, active_time=2433 secs
Nov  6 02:19:46 L4 ntpd[23035]: 91.189.94.4 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: 212.7.1.132 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: 193.40.0.5 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: 5.101.116.20 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: 46.22.223.220 interface 10.144.34.75 -> (none)
Nov  6 02:19:46 L4 ntpd[23035]: peers refreshed
Nov  6 02:19:48 L4 ModemManager[982]: [/dev/cdc-wdm0] Queried max control message size: 512
Nov  6 02:19:48 L4 ModemManager[982]: <info>  Creating modem with plugin 'Generic' and '3' ports
Nov  6 02:19:48 L4 ModemManager[982]: <info>  Modem for device at '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-10' successfully created
Nov  6 02:19:48 L4 ModemManager[982]: [/dev/cdc-wdm0] Queried max control message size: 512
Nov  6 02:19:49 L4 ModemManager[982]: <info>  Modem: state changed (unknown -> disabled)
Nov  6 02:19:49 L4 NetworkManager[1024]: <warn> (cdc-wdm0): failed to look up interface index
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> WWAN now disabled by management service
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): new Broadband device (driver: 'cdc_mbim, cdc_acm' ifindex: 0)
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): exported as /org/freedesktop/NetworkManager/Devices/6
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): deactivating device (reason 'managed') [2]
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> NetworkManager state is now DISCONNECTED
Nov  6 02:19:49 L4 NetworkManager[1024]: <info> (cdc-wdm0): device state change: unavailable -> disconnected (reason 'none') [20 30 0]



after that I can no longer reconnect:
Aug 26 16:45:03 L4 NetworkManager[965]: <info> Activation (cdc-wdm1) starting connection 'EE Elisa Any'
Aug 26 16:45:03 L4 NetworkManager[965]: <info> (cdc-wdm1): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Aug 26 16:45:03 L4 NetworkManager[965]: <info> Activation (cdc-wdm1) Stage 1 of 5 (Device Prepare) scheduled...
Aug 26 16:45:03 L4 NetworkManager[965]: <info> Activation (cdc-wdm1) Stage 1 of 5 (Device Prepare) started...
Aug 26 16:45:03 L4 NetworkManager[965]: <info> Activation (cdc-wdm1) Stage 1 of 5 (Device Prepare) complete.
Aug 26 16:45:03 L4 ModemManager[923]: <info>  Simple connect started...
Aug 26 16:45:03 L4 ModemManager[923]: <info>  Simple connect state (4/8): Wait to get fully enabled
Aug 26 16:45:03 L4 ModemManager[923]: <info>  Simple connect state (5/8): Register
Aug 26 16:45:03 L4 ModemManager[923]: <info>  Simple connect state (6/8): Bearer
Aug 26 16:45:03 L4 ModemManager[923]: <info>  Simple connect state (7/8): Connect
Aug 26 16:45:03 L4 ModemManager[923]: <info>  Modem /org/freedesktop/ModemManager1/Modem/12: state changed (registered -> connecting)
Aug 26 16:45:03 L4 NetworkManager[965]: <info> (cdc-wdm1) modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Aug 26 16:45:03 L4 ModemManager[923]: <info>  Modem /org/freedesktop/ModemManager1/Modem/12: state changed (connecting -> registered)
Aug 26 16:45:03 L4 NetworkManager[965]: <info> (cdc-wdm1) modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Aug 26 16:45:03 L4 NetworkManager[965]: <warn> (cdc-wdm1) failed to connect modem: Failure
Aug 26 16:45:03 L4 NetworkManager[965]: <info> (cdc-wdm1): device state change: prepare -> failed (reason 'unknown') [40 120 1]
Aug 26 16:45:03 L4 NetworkManager[965]: <info> Marking connection 'EE Elisa Any' invalid.
Aug 26 16:45:03 L4 NetworkManager[965]: <warn> Activation (cdc-wdm1) failed for connection 'EE Elisa Any'
Aug 26 16:45:03 L4 NetworkManager[965]: <info> (cdc-wdm1): device state change: failed -> disconnected (reason 'none') [120 30 0]
Aug 26 16:45:03 L4 NetworkManager[965]: <info> (cdc-wdm1): deactivating device (reason 'none') [0]

答案2

我在使用 Sierra Wireless MC7710 时也遇到了同样的问题。这些问题发生在我禁用 PIN 之后，因为每次登录时都会被要求输入密钥环和 PIN，这让我很恼火。组权限似乎出了问题。在我的例子中，“组”中缺少“拨出”，我添加了它

sudo usermod -a -G dip,dialout $(whoami)

如下所述：

https://wiki.ubuntuusers.de/Mobiler_Datentransfer/UMTS-Checkliste/

重新启动后，调制解调器就可以工作了。

与该问题无关过去几年，我遇到过网络管理器的错误行为，有时 GUI 中会缺少“连接”选项，重启 1 或 2 次后又会恢复。最近，我还找到了解决方案，因此，如果你的调制解调器有问题，有时网络指示器不显示，那么这总是值得一试的：当网络管理器缺少连接选项时，有两个选项：

答：只需重新启动网络管理器，在 16.04 中可以使用：

sudo systemctl restart NetworkManager

B. 使用 KDE 网络管理器并与其连接（这也有能够创建热点的优点）。

  1. 要在 Ubuntu 中安装 KDE Netwok Manger（以及标准版本）：

    sudo apt-get update; sudo apt-get install plasma-nm

  2. 修复 Unity Dash 中缺失的条目：“kde5-nm-connection-editor”现已安装，但由于错误，未显示在 Unity Dash 中。要修复此问题，请打开终端并输入：

    sudo -H gedit /usr/share/applications/kde5-nm-connection-editor.desktop

    NoDisplay=true然后通过在包含以下内容的行前添加内容来注释该行#，并保存更改。

  3. 现在通过 Dash 搜索并打开：kde5-nm-connection-editor

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