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Thread: Trouble with ethernet connection, 18.04

  1. #1
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    Trouble with ethernet connection, 18.04

    Having trouble getting the ethernet connection to work on one of my Ubuntu machines following my gigabit fiber installation. It works on one machine and not the other

    Not working:
    I plug in the cable to the Surface Laptop dock, and I see a light there. Ubuntu 18.04.

    Does not switch to the wired connection and I can't find where to select in the UI.

    I'm following the Ubuntu documentation here: https://help.ubuntu.com/stable/ubunt...manual.html.en

    But the instructions don't seem to match the dialog I see. (see attachment)

    I looked a few answers about setting up an ethernet connection but could not get it to work.

    Working:
    Plugged the cable into my Ubuntu 16.04 machine and it switched over to the wired connection automatically.


    I get only about 150mbps on the wifi, and 945mbps on the wired connection so I really want to get it to work.


    $ sudo lshw -C network
    *-network
    description: Wireless interface
    product: 88W8897 [AVASTAR] 802.11ac Wireless
    vendor: Marvell Technology Group Ltd.
    physical id: 0
    bus info: pci@0000:02:00.0
    logical name: wlp2s0
    version: 00
    serial: c4:9d:ed:a8:15:51
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
    configuration: broadcast=yes driver=mwifiex_pcie ip=192.168.86.176 latency=0 multicast=yes wireless=IEEE 802.11
    resources: irq:132 memory:a1500000-a15fffff memory:a1400000-a14fffff
    *-network
    description: Ethernet interface
    physical id: 1
    logical name: docker0
    serial: 02:42:12:c2:18:e1
    capabilities: ethernet physical
    configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=172.17.0.1 link=no multicast=yes

    $ lspci | grep -i net
    02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88W8897 [AVASTAR] 802.11ac Wireless
    Attached Images Attached Images
    Last edited by James_Creasy; October 11th, 2018 at 01:15 AM.

  2. #2
    Join Date
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    Ubuntu Mate Development Release

    Re: Trouble with ethernet connection, 18.04

    open a terminal and type

    Code:
    ip link
    post the output & use code tags please...
    Last edited by NM5TF; October 11th, 2018 at 03:15 AM.
    Registered Linux User # 529389
    Arch Linux, Linux Mint 18.3 Sylvia, Solus 3.9999 Linux
    my personal web page http://users.gilanet.com/~tfrost

  3. #3
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    Re: Trouble with ethernet connection, 18.04

    Code:
    $ ip link
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
        link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000
        link/ether c4:9d:ed:a8:15:51 brd ff:ff:ff:ff:ff:ff
    3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default 
        link/ether 02:42:69:52:87:af brd ff:ff:ff:ff:ff:ff
    4: enxbc8385f72540: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
        link/ether bc:83:85:f7:25:40 brd ff:ff:ff:ff:ff:ff
    Last edited by wildmanne39; October 11th, 2018 at 05:13 PM. Reason: Added code tags, Normalized Fonts

  4. #4
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    Re: Trouble with ethernet connection, 18.04

    Based on that output I added this to the interfaces file

    auto enxbc8385f72540
    iface enxbc8385f72540 inet dhcp

    and did:

    sudo ifup enxbc8385f72540

    and success! Thanks! (edited: premature, did not work on reboot, see below)









    Attached Images Attached Images
    Last edited by James_Creasy; October 11th, 2018 at 05:18 PM.

  5. #5
    Join Date
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    Re: Trouble with ethernet connection, 18.04

    Great news !!!

    now if you could mark the thread SOLVED so others can use the information, it would be great

    tommy
    Last edited by NM5TF; October 11th, 2018 at 01:22 PM. Reason: typo
    Registered Linux User # 529389
    Arch Linux, Linux Mint 18.3 Sylvia, Solus 3.9999 Linux
    my personal web page http://users.gilanet.com/~tfrost

  6. #6
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    Re: Trouble with ethernet connection, 18.04

    Thanks for the reminder. Somehow, and somewhat ironically, the SSO for this forum has bifurcated my logins so I have a different one on each machine. Could not find the Solved option until I figured that out.

  7. #7
    Join Date
    Feb 2008
    Location
    Texas
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    25,319
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Trouble with ethernet connection, 18.04

    the SSO for this forum has bifurcated my logins so I have a different one on each machine. Could not find the Solved option until I figured that out.
    Do you mean you have a different username depending which machine you login on? If so please start a thread in the Resolution Centre and we will work on fixing the issue.

    https://ubuntuforums.org/forumdisplay.php?f=123
    Last edited by wildmanne39; October 11th, 2018 at 04:26 PM.

  8. #8
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    Re: Trouble with ethernet connection, 18.04

    I just marked the thread unsolved because today when I booted the machine,

    Code:
    ip link
    no longer shows my Ethernet interface. There is still a missing piece to this puzzle.

    Code:
    $ sudo ifup enxbc8385f72540
    Internet Systems Consortium DHCP Client 4.3.5
    Copyright 2004-2016 Internet Systems Consortium.
    All rights reserved.
    For info, please visit https://www.isc.org/software/dhcp/
    
    Cannot find device "enxbc8385f72540"
    Error getting hardware address for "enxbc8385f72540": No such device
    
    If you think you have received this message due to a bug rather
    than a configuration issue please read the section on submitting
    bugs on either our web page at www.isc.org or in the README file
    before submitting a bug.  These pages explain the proper
    process and the information we find helpful for debugging..
    
    exiting.
    Failed to bring up enxbc8385f72540.
    Last edited by James_Creasy; October 11th, 2018 at 06:27 PM. Reason: Normalized Fonts

  9. #9
    Join Date
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    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Trouble with ethernet connection, 18.04

    Please use the default font color and properties unless you need to highlight or draw attention to a part of your post.

    Please use code tags - if you are using New Reply button - highlight text and use the # button in the text box header.

    If using Quick Reply then [code] at the beginning and [/code] at the end.

  10. #10
    Join Date
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    Re: Trouble with ethernet connection, 18.04

    Is that better? Thanks for the tips, did not find the code tags prior.

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