Ethernet connection stopped working in Ubuntu 20.04

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I installed Ubuntu 20.04 on a brand new Dell Latitude 5500 about 10 days ago. My ethernet conection has been working fine for one week but then it has not been working at all for the last 3 days. Network settings just say “Cable unplugged”.

ifconfig command shows this:


eno2: flags=4099  mtu 1500        ether c0:3e:ba:47:32:4a  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 16  memory 0x91300000-91320000

sudo lshw -C network command shows this:


      description: Ethernet interface
      product: Ethernet Connection (6) I219-V
      vendor: Intel Corporation
      physical id: 1f.6
      bus info: pci@0000:00:1f.6
      logical name: eno2
      version: 30
      serial: c0:3e:ba:47:32:4a
      capacity: 1Gbit/s
      width: 32 bits
      clock: 33MHz
      capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
      configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.5-4 latency=0 link=no multicast=yes port=twisted pair
      resources: irq:127 memory:91300000-9131ffff

Is anything wrong in these outputs ? My understanding of these is limited so any help would be appreciated.

When I start Ubuntu live from a USB stick, same I cannot connect via the ethernet cable, although it worked fine when I installed Ubuntu on the machine.

Nothing wrong with the cable as it works on another laptop running with Windows.

Could it be a hardware problem ? A driver issue ? Network manager ??

Thanks a lot for your help, this is frustrating…


A comment on "Ethernet connection stopped working in Ubuntu 20.04"

  1. Uribe Aldo says:

    Hi, I have the same problem, in ubuntu 19.1 Ethernet was good, but when I update it to 20.04 I have a cable unplugged.
    I proved two options then I restarted my PC, maybe it works for you:

    1st: Update Ub and install net-tools
    sudo apt-get update -y
    sudo apt-get install -y net-tools
    2nd: Installing udav.
    sudo apt-get install udav
    3rd: Rebooting your PC

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