環境：Ubuntu 16.04/AMD Ryzen 5/華碩 B350M-A。
當我將 Android 智慧型手機（LG K220dsz/Micromax MT500）連接到桌上型電腦後，有網路連接，但反覆關閉，而是掛載 Android 資料夾。
網路顯示：有線連接1。
如何讓 USB 網路共用連線穩定？
5 10:17:39 Gulshan-Sukhobristi-AA3-NT org.freedesktop.Geoclue.Providers.UbuntuGeoIP[1547]: ** (ubuntu-geoip-provider:1862): WARNING **: Unable to connect to geoip service, status: 2
Nov 5 10:21:39 Gulshan-Sukhobristi-AA3-NT org.freedesktop.Geoclue.Providers.UbuntuGeoIP[1547]: ** (ubuntu-geoip-provider:1862): WARNING **: Unable to connect to geoip service, status: 2
Nov 5 10:21:58 Gulshan-Sukhobristi-AA3-NT smartd[1012]: Device: /dev/sda [SAT], SMART Prefailure Attribute: 1 Raw_Read_Error_Rate changed from 96 to 97
Nov 5 10:21:58 Gulshan-Sukhobristi-AA3-NT smartd[1012]: Device: /dev/sda [SAT], SMART Usage Attribute: 195 Hardware_ECC_Recovered changed from 91 to 90
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.268549] cdc_acm 5-1:1.3: urb 11 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.268559] usb 5-1: USB disconnect, device number 10
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.268623] cdc_acm 5-1:1.3: urb 12 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.268710] cdc_acm 5-1:1.3: urb 13 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.268721] rndis_host 5-1:1.0 enp40s0f3u1: unregister 'rndis_host' usb-0000:28:00.3-1, RNDIS device
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.268783] cdc_acm 5-1:1.3: urb 14 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.268825] cdc_acm 5-1:1.3: urb 15 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.268903] cdc_acm 5-1:1.3: urb 0 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.268985] cdc_acm 5-1:1.3: urb 1 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.269073] cdc_acm 5-1:1.3: urb 2 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.269144] cdc_acm 5-1:1.3: urb 3 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.269224] cdc_acm 5-1:1.3: urb 4 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.269304] cdc_acm 5-1:1.3: urb 5 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.269384] cdc_acm 5-1:1.3: urb 6 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.269465] cdc_acm 5-1:1.3: urb 7 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.269548] cdc_acm 5-1:1.3: urb 8 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.269628] cdc_acm 5-1:1.3: urb 9 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.269704] cdc_acm 5-1:1.3: urb 10 failed submission with -19
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <info> [1509857521.7920] devices removed (path: /sys/devices/pci0000:00/0000:00:07.1/0000:28:00.3/usb5/5-1/5-1:1.0/net/enp40s0f3u1, iface: enp40s0f3u1)
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT ModemManager[2957]: <info> (net/enp40s0f3u1): released by modem /sys/devices/pci0000:00/0000:00:07.1/0000:28:00.3/usb5/5-1
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT kernel: [ 2106.299947] cdc_acm 5-1:1.2: failed to set dtr/rts
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT ModemManager[2957]: <info> (tty/ttyACM0): released by modem /sys/devices/pci0000:00/0000:00:07.1/0000:28:00.3/usb5/5-1
Nov 5 10:22:01 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <info> [1509857521.8224] device (ttyACM0): state change: unavailable -> unmanaged (reason 'removed') [20 10 36]
Nov 5 10:22:22 Gulshan-Sukhobristi-AA3-NT kernel: [ 2126.607945] usb 5-1: new high-speed USB device number 11 using xhci_hcd
Nov 5 10:22:22 Gulshan-Sukhobristi-AA3-NT kernel: [ 2126.748408] usb 5-1: New USB device found, idVendor=1004, idProduct=631c
Nov 5 10:22:22 Gulshan-Sukhobristi-AA3-NT kernel: [ 2126.748411] usb 5-1: New USB device strings: Mfr=2, Product=3, SerialNumber=4
Nov 5 10:22:22 Gulshan-Sukhobristi-AA3-NT kernel: [ 2126.748413] usb 5-1: Product: LGE Android Phone
Nov 5 10:22:22 Gulshan-Sukhobristi-AA3-NT kernel: [ 2126.748414] usb 5-1: Manufacturer: LGE
Nov 5 10:22:22 Gulshan-Sukhobristi-AA3-NT kernel: [ 2126.748416] usb 5-1: SerialNumber: LGK2204SN7IB99
Nov 5 10:22:22 Gulshan-Sukhobristi-AA3-NT org.gtk.vfs.GPhoto2VolumeMonitor[1547]: (process:1908): GVFS-GPhoto2-WARNING **: device (null) has no BUSNUM property, ignoring
Nov 5 10:23:41 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.247087] usb 5-1: USB disconnect, device number 11
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.583588] usb 5-1: new high-speed USB device number 12 using xhci_hcd
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.724439] usb 5-1: New USB device found, idVendor=1004, idProduct=6344
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.724442] usb 5-1: New USB device strings: Mfr=2, Product=3, SerialNumber=4
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.724444] usb 5-1: Product: LGE Android Phone
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.724446] usb 5-1: Manufacturer: LGE
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.724448] usb 5-1: SerialNumber: LGK2204SN7IB99
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <warn> [1509857622.2702] device (usb0): failed to find device 6 'usb0' with udev
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <info> [1509857622.2715] manager: (usb0): new Ethernet device (/org/freedesktop/NetworkManager/Devices/4)
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.751500] rndis_host 5-1:1.0 usb0: register 'rndis_host' at usb-0000:28:00.3-1, RNDIS device, 26:44:16:da:5b:9c
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.752000] cdc_acm 5-1:1.2: ttyACM0: USB ACM device
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT mtp-probe: checking bus 5, device 12: "/sys/devices/pci0000:00/0000:00:07.1/0000:28:00.3/usb5/5-1"
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT mtp-probe: bus: 5, device: 12 was not an MTP device
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT kernel: [ 2206.764419] rndis_host 5-1:1.0 enp40s0f3u1: renamed from usb0
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <info> [1509857622.2980] device (usb0): interface index 6 renamed iface from 'usb0' to 'enp40s0f3u1'
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <info> [1509857622.3022] devices added (path: /sys/devices/pci0000:00/0000:00:07.1/0000:28:00.3/usb5/5-1/5-1:1.0/net/enp40s0f3u1, iface: enp40s0f3u1)
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <info> [1509857622.3023] device added (path: /sys/devices/pci0000:00/0000:00:07.1/0000:28:00.3/usb5/5-1/5-1:1.0/net/enp40s0f3u1, iface: enp40s0f3u1): no ifupdown configuration found.
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <info> [1509857622.3025] device (enp40s0f3u1): state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <info> [1509857622.3031] device (enp40s0f3u1): link connected
Nov 5 10:23:42 Gulshan-Sukhobristi-AA3-NT NetworkManager[3243]: <info> [1509857622.3041] device (enp40s0f3u1): reset MAC address to 26:44:16:DA:5B:9C