USB 网络共享不断断开连接

Question

我正在尝试通过我的 LG G4 的 USB 网络共享进行连接。我有 Ubuntu 16.04

网络共享仅工作 1 或 2 分钟，但之后断开连接。如果我拔下并再次插入电缆，它会重新连接，但只需一分钟左右。
如果我激活 wifi 网络共享它工作正常..

谁能给我一些关于如何诊断和理解为什么会发生这种情况的建议？

提前致谢 ：）

Answer 1

从 14.04 升级到 16.04.1 后，我刚刚遇到了这个完全相同的问题（USB 网络共享在此情况下可以正常工作多年）。

根据 syslog，它看起来是由与 ModemManager 的冲突引起的。

Aug 25 13:12:24 outback NetworkManager[2543]: <info>  [1472145144.1334] device (enp0s20u2): Activation: successful, device activated.
[...eliding log entries related to nm-dispatcher services]
Aug 25 13:12:38 outback ModemManager[2503]: <info>  Creating modem with plugin 'Generic' and '2' ports
Aug 25 13:12:38 outback ModemManager[2503]: <info>  Modem for device at '/sys/devices/pci0000:00/0000:00:14.0/usb3/3-2' successfully created
Aug 25 13:12:41 outback ModemManager[2503]: <warn>  couldn't load Manufacturer: 'Serial command timed out'
Aug 25 13:12:44 outback ModemManager[2503]: <warn>  couldn't load Model: 'Serial command timed out'
Aug 25 13:12:47 outback ModemManager[2503]: <warn>  couldn't load Revision: 'Serial command timed out'
Aug 25 13:12:50 outback ModemManager[2503]: <warn>  couldn't load Equipment Identifier: 'Serial command timed out'
Aug 25 13:12:50 outback ModemManager[2503]: <warn>  couldn't load Operator name: 'SIM failed to handle CRSM request (sw1 106 sw2 130)'
Aug 25 13:12:54 outback ModemManager[2503]: <warn>  couldn't load IMEI: 'Serial command timed out'
Aug 25 13:12:54 outback ModemManager[2503]: <info>  Modem: state changed (unknown -> disabled)
Aug 25 13:12:54 outback NetworkManager[2543]: <info>  [1472145174.3879] device (enp0s20u2): state change: activated -> deactivating (reason 'connection-removed') [100 110 38]
Aug 25 13:12:54 outback NetworkManager[2543]: <info>  [1472145174.3881] manager: NetworkManager state is now DISCONNECTING
Aug 25 13:12:54 outback NetworkManager[2543]: <info>  [1472145174.4362] dns-mgr: Writing DNS information to /sbin/resolvconf
Aug 25 13:12:54 outback dnsmasq[4348]: setting upstream servers from DBus
Aug 25 13:12:54 outback NetworkManager[2543]: <info>  [1472145174.4430] manager: (ttyACM0): new Broadband device (/org/freedesktop/NetworkManager/Devices/4)
Aug 25 13:12:54 outback NetworkManager[2543]: <info>  [1472145174.4441] device (ttyACM0): state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Aug 25 13:12:54 outback NetworkManager[2543]: <info>  [1472145174.4445] device (ttyACM0): modem state 'enabling'
Aug 25 13:12:54 outback NetworkManager[2543]: <info>  [1472145174.4457] device (enp0s20u2): state change: deactivating -> disconnected (reason 'connection-removed') [110 30 38]

我通过以下命令禁用了 ModemManager：

sudo systemctl disable ModemManager.service

然后重新启动。从那时起，我随后的 USB 网络共享会话一直很稳定。

我确信有一种方法可以为我的手机（LG G3）正确配置 ModemManager，但我目前不需要串行调制解调器，所以这种方法对我有用。

Answer 2

对我来说，这个命令有效：

sudo systemctl stop ModemManager.service

使用disable而stop不是不起作用。然后我重新打开 NetworkManager：

sudo NetworkManager