networking - Ethernet connect and disconnect - Ask Ubuntu


i'm using ubuntu 16.04 lts , after connect ethernet cable, system show connected icon.

but after few seconds, system show disconnect alert. here log:

oct 25 19:09:40 note dbus[769]: [system] activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' oct 25 19:09:40 note systemd[1]: starting network manager script dispatcher service... oct 25 19:09:40 note dbus[769]: [system] activated service 'org.freedesktop.nm_dispatcher' oct 25 19:09:40 note systemd[1]: started network manager script dispatcher service. oct 25 19:09:40 note nm-dispatcher: req:1 'down' [enp19s0]: new request (1 scripts) oct 25 19:09:40 note nm-dispatcher: req:1 'down' [enp19s0]: start running ordered scripts... 

runing sudo lshw -c net

  *-network                       description: network controller        product: bcm4313 802.11bgn wireless network adapter        vendor: broadcom corporation        physical id: 0        bus info: pci@0000:12:00.0        version: 01        width: 64 bits        clock: 33mhz        capabilities: pm msi pciexpress bus_master cap_list        configuration: driver=bcma-pci-bridge latency=0        resources: irq:17 memory:fbb00000-fbb03fff   *-network        description: ethernet interface        product: ar8152 v2.0 fast ethernet        vendor: qualcomm atheros        physical id: 0        bus info: pci@0000:13:00.0        logical name: enp19s0        version: c1        serial: f0:4d:a2:d7:11:90        capacity: 100mbit/s        width: 64 bits        clock: 33mhz        capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation        configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.1-napi latency=0 link=no multicast=yes port=twisted pair        resources: irq:32 memory:fba00000-fba3ffff ioport:e000(size=128)   *-network disabled        description: wireless interface        physical id: 2        logical name: wlp18s0b1        serial: c0:cb:38:9c:4d:f6        capabilities: ethernet physical wireless        configuration: broadcast=yes driver=brcmsmac driverversion=4.4.0-43-generic firmware=610.812 link=no multicast=yes wireless=ieee 802.11bgn 


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