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Thread: Ubuntu 12.04 doesn't show wired connection, Win7 does

  1. #1
    Join Date
    Oct 2010
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    4

    Question Ubuntu 12.04 doesn't show wired connection, Win7 does

    I have a wired connection in my student dorm room which doesn't come up in network-manager with 12.04. It does work with Windows 7 though,so it's not anything hardware related,i would say.
    On a spare partition on my HD i tried installing another 12.04,just to be sure it wasn't some configuration of mine being wrong: turns out,it doesn't work either.
    The funny thing is that NM would recognize the connection until yesterday,so i thought some update had to with this,but there was nothing in the logs that seems to be able to break something network related..

    My /etc/NetworkManager/NetworkManager.conf:

    Code:
     [main]
        plugins=ifupdown,keyfile
        dns=dnsmasq
        
        [ifupdown]
        managed=false
    My /etc/network/interfaces:

    Code:
    auto lo
        iface lo inet loopback
        
        auto eth0
        #iface eth0 inet dhcp
    I don't know why the last line is commented,but i tried uncommenting it but it wouldn't work,and even worse it would say "device unmanaged". I then tried setting managed=true but it went back to not recognizing the connection,so i just rolled everything back.

    ifconfig eth0 :

    Code:
    eth0      Link encap:Ethernet  HWaddr 00:26:9e:0a:2a:e3  
                  UP BROADCAST MULTICAST  MTU:1500  Metric:1
                  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
                  TX 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)
                  Interrupt:47 Base address:0xc000
    lshw -C network:

    Code:
    *-network
               description: Ethernet interface
               product: RTL8111/8168B PCI Express Gigabit Ethernet controller
               vendor: Realtek Semiconductor Co., Ltd.
               physical id: 0
               bus info: pci@0000:03:00.0
               logical name: eth0
               version: 02
               serial: 00:26:9e:0a:2a:e3
               size: 10Mbit/s
               capacity: 1Gbit/s
               width: 64 bits
               clock: 33MHz
               capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
               configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=N/A latency=0 link=no multicast=yes port=MII speed=10Mbit/s
               resources: irq:47 ioport:5000(size=256) memory:d1010000-d1010fff memory:d1000000-d100ffff memory:d1020000-d102ffff
    lspci:

    Code:
    03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
    /var/log/dpkg.log (just the part for yesterday,because yesterday connection worked):
    http://pastebin.ubuntu.com/1010341/

    The wired connection isn't even seen by ubuntu..it's like the cable was unplugged!
    Anybody that can help me?
    Last edited by mark90; May 28th, 2012 at 09:48 PM. Reason: [SOLVED]Wasn't an actual ubuntu problem

  2. #2
    Join Date
    Aug 2011
    Location
    Berlin, Germany
    Beans
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    Distro
    Ubuntu Gnome 14.04 Trusty Tahr

    Re: Ubuntu 12.04 doesn't show wired connection, Win7 does

    Remove anything but the 2 "lo" lines, remove any connection in the NM-applet in "cable" and "DSL", if any, and reboot.

  3. #3
    Join Date
    Oct 2010
    Beans
    4

    Re: Ubuntu 12.04 doesn't show wired connection, Win7 does

    Ok,so it still doesn't show up in NM, but NM created automatically a "Wired connection 1" (which doesn't work,though)

  4. #4
    Join Date
    Aug 2011
    Location
    Berlin, Germany
    Beans
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    Distro
    Ubuntu Gnome 14.04 Trusty Tahr

    Re: Ubuntu 12.04 doesn't show wired connection, Win7 does

    Remove the package "resolvconf", and reboot.

  5. #5
    Join Date
    Oct 2010
    Beans
    4

    Re: Ubuntu 12.04 doesn't show wired connection, Win7 does

    Still nothing..plus i tried,just to see the output:

    Code:
    sudo ifup eth0
    Ignoring unknown interface eth0=eth0.
    
    sudo ifdown eth0
    ifdown: interface eth0 not configured
    Last edited by mark90; May 28th, 2012 at 08:25 AM.

  6. #6
    Join Date
    Aug 2011
    Location
    Berlin, Germany
    Beans
    5,666
    Distro
    Ubuntu Gnome 14.04 Trusty Tahr

    Re: Ubuntu 12.04 doesn't show wired connection, Win7 does

    Did it work with the Live-CD?

    Tried to reset the BIOS?

  7. #7
    Join Date
    Oct 2010
    Beans
    4

    Re: Ubuntu 12.04 doesn't show wired connection, Win7 does

    Ok,turns out it's not ubuntu's problem: there were some issues with cables and switches and stuff..
    Thanks a lot for your time anyway!Really appreciated it!

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