No ethernet connection available in Ubuntu 20.04

I just installed Ubuntu 20.04 on a clean SSD alongside windows to do C development and when I first booted, there was no internet connection yet my ethernet worked perfectly in windows.

My network controller is the realtek RTL8125 2.5 gb and is labelled “UNCLAIMED” when I run the lshw -C network command. I can access the internet using a USB tether to my phone but nothing I have tried so far has fixed the problem.

Would appreciate any help

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Author: Liam Doughty

Why is Ubuntu 20.04 not registering ethernet on my Raspberry Pi?

When the Raspberry Pi boots up, Ubuntu 20.04 says the following:
Net: No ethernet found.
starting USB…
No working controllers found

It continues to boot up, but this means that I can not install a desktop environment on it. The ethernet port and cable work fine, and the Raspberry Pi ethernet jack lights up when the cable is plugged in. How do I get ethernet to be recognized?
Thanks!

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Author: techyguy2

Help please – installed ubuntu 18.04 lts – cant get ethernet/wifi working

I have a dell optiplex 9010 desktop PC. I have just installed ubuntu 18.04, alongside windows 10, on my hard disc in a separate partition. All is ok except I cannot establish an internet connection.
When I go onto settings> Wi-fi…..it says no wifi adapter found. I have tried running an ethernet cable from laptop to desktop but it will not establish a connection. I then tried tethering my mobile phone and this allowed me to go online however I still cant figure out how to install the drivers!!

Using my laptop (packard bell) I have looked online for the drivers for these devices only because I am assuming the device drivers are not present, I downloaded from an intel web site what I think are the related drivers. The name on the file to be extracted was e1000e-3.8.4.tar.gz.
I have extracted these files to a usb stick but have no idea if 1) This is the probable fix and 2) if it is how can I upload these drivers to my desktop. (my desktop is an optiplex 9010)

I am very new to linux and following some suggestions online I used the terminal command ‘lspci’ and this showed the following what I believe to be wifi/ethernet related devices on the system:

  1. ethernet controller [0200]:intel corp 82579LM gigabit network connection.
    Subsystem: Dell 82579LM gigabit network connection.
    Kernel driver in use: e1000e.
    Kernel modules: e1000e
  2. ethernet controller [0200]:intel corp 82572EI gigabit ethernet controller. Subsystem: intel corp PRO/1000PT server adapter [8086:1082]
    Kernel driver in use: e1000e.
    Kernel modules: e1000e

I have two ethernet cards in my desktop.

  1. Intel PRO/1000PT server adapter 82572EI and…
  2. Intel 82579LM gigabit network connection…

Any help would be very much appreciated. Thanks in advance.

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Author: zatta303

Ethernet Interface Enumeration Order

Ethernet Interface Enumeration Order

I have an embedded Linux machine which has two Ethernet interfaces.

Each Ethernet interface also has a USB hub. The first Ethernet interface is connected via its own USB hub which is in turn connected directly to the embedded device.

The second Ethernet interface is connected to its own USB hub which is in turn connected to the USB hub of its first ethernet interface.

It is certain that the first ethernet device will always be eth0 and the second will be eth1, or do I need to take extra measures?

USB Device Tree

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Author: Cez Chi