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Thread: Ethernet Not Working on Ubuntu 14.04 LTS

  1. #1
    Join Date
    Mar 2014
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    16

    Ethernet Not Working on Ubuntu 14.04 LTS

    Hi Eyeryone,

    I've been using Ubuntu 13.10 for a while and just updated to 14.04 yesterday and my ethernet doesn't work at all. When I plug in the wire the light flashes and the computer tries to connect but doesn't. I've heard other people on the forums had this issue but no one seems to have solved it yet. I have a wifi adapter but it only works in Windows but I can't download the drivers for it because the ethernet won't work. Does anyone know how to fix this problem?

  2. #2
    Join Date
    Mar 2014
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    16

    Re: Ethernet Not Working on Ubuntu 14.04 LTS

    *bump

  3. #3
    Join Date
    Jul 2010
    Location
    ozarks, Arkansas, USA
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    6,588
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: Ethernet Not Working on Ubuntu 14.04 LTS

    sps828gaming; Patience !

    Let thoe who do know who might be able to help the most have a chance to see your request.

    However, it is me that responds 1st.

    Let's begin with the basics for a general looksee:
    1. network card detected ?
    Code:
    sudo lshw -C network
    lspci | grep Ethernet
    2. IP address assigned ?
    Code:
    ipconfig eth0 ##(or whichever the network is,eth1)
    3. Check /etc/network/interfaces
    Code:
    cat /etc/network/interfaces
    4. DNS resolution ?
    Code:
    cat /etc/resolv.conf
    ls -la /etc/resolvconf/resolv.conf.d/base ##empty as in size 0 ?
    And see where we fo from here.

    it is all a process
    THE current(cy) in Documentation:
    https://help.ubuntu.com/community/PopularPages

    Happy ubutu'n !

  4. #4
    Join Date
    Mar 2014
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    16

    Re: Ethernet Not Working on Ubuntu 14.04 LTS

    Yes, the network card is recognized and I don't see an ip address. The only thing that could be the ip address inet6 address. When I typed in
    Code:
    cat /etc/network/interfaces
    I get

    Code:
    # interfaces(5) file used by ifup(8) and ifdown(8)
    auto lo
    iface lo inet loopback
    And when I type in

    Code:
    cat /etc/resolv.conf
    I get

    Code:
    # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
    #        DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
    And when I type in

    Code:
    ls -la /etc/resolvconf/resolv.conf.d/base ##empty as in size 0 ?
    I get

    Code:
    -rw-r--r== 1 root root 0 Dec 13  2012 /etc/resolvconf/resolv.conf.d/base

  5. #5
    Join Date
    Jul 2010
    Location
    ozarks, Arkansas, USA
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    6,588
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: Ethernet Not Working on Ubuntu 14.04 LTS

    sps828gaming; Well !

    No /etc/resolv.conf contents ?, we will get back to that.

    What returns from terminal commands:
    Code:
    ifconfig
    Making progress
    slowly
    THE current(cy) in Documentation:
    https://help.ubuntu.com/community/PopularPages

    Happy ubutu'n !

  6. #6
    Join Date
    Jan 2006
    Location
    Not heaven... Iowa
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Ethernet Not Working on Ubuntu 14.04 LTS

    Thats a normal-looking /etc/network/interfaces for a system running Network Manager.
    ifconfig (or ifconfig -a) should show what the interfaces (network cards) are up to.
    Linux User #415691 Ubuntu User #8629
    Iowa Team (LoCo): [Wiki] [Launchpad] [Sub-forum]
    IRC channel: #ubuntu-us-ia on irc.freenode.net

  7. #7
    Join Date
    Mar 2014
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    16

    Re: Ethernet Not Working on Ubuntu 14.04 LTS

    I get

    Code:
    eth0       Link encap:Ethernet  HWaddr 94:de:80:dc:19:de
                 inet6 adr: fe80::96de:80ff:fedc:19de/64 Scope:Link
                 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
                 RX packets:0 errors:0 dropped:0 overruns:0 carrier:0
                 collisions:0 txqueuelen:1000
                 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
                 Interrupts:18
    
    lo          Link encap:Local Loopback
                inet addr:127.0.0.1 Mask:255.0.0.0
                inet6 addr: ::1/128 Scope:Host
                UP LOOPBACK RUNNING MTU:65536 Metric:1
                RX packets:305 errors:0 dropped:0 overruns:0 frame:0
                TX packets:305 errors:0 dropped:0 overruns:0 carrier:0
                collisions:0 txqueuelen:0
                RX bytes:22913 (22.9 KB) TX bytes:22913 (22.9 KB)

  8. #8
    Join Date
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    Lubuntu 14.04 Trusty Tahr

    Re: Ethernet Not Working on Ubuntu 14.04 LTS

    sps828gaming; UnGood.

    No "inet addr' returned. Are you on a router ?
    if so try and "reclone" the router, and reboot the system.

    goota be a cause
    THE current(cy) in Documentation:
    https://help.ubuntu.com/community/PopularPages

    Happy ubutu'n !

  9. #9
    Join Date
    Mar 2014
    Beans
    16

    Re: Ethernet Not Working on Ubuntu 14.04 LTS

    Hi everyone sorry for this thread turns out the port I was plugged into on the router was dead! but I plugged it in to another port and all is working! Thanks for the help!

  10. #10
    Join Date
    Jul 2010
    Location
    ozarks, Arkansas, USA
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    6,588
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: Ethernet Not Working on Ubuntu 14.04 LTS

    sps828gaming; Hey, Great.

    Glad the problem was found.

    Please mark this thread solved; aides others seeking the solution, helps keep the forum clean and precludes others miss-directing efforts to aid.
    Top of post -> thread tools

    just keep on keep'n on
    THE current(cy) in Documentation:
    https://help.ubuntu.com/community/PopularPages

    Happy ubutu'n !

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