No ethernet connection

[visiblepotato]

Ubuntu won't recognize my ethernet. I have no wifi in my PC so this means I have no internet connection.

[CelticWarrior]

Welcome.

Please post the results of the following commands:

sudo lshw -C network; lsb_release -a; uname -a

[TheFu]

If you have a chicken-egg problem with lshw not already existing, either of these commands should provide some network device information:

lspci -vk |egrep --after-context=8 'Ethernet|Network'
lspci -vk |perl -lne 'print if /Ethernet|Network/ .. /^[\w]*$/'

The first is probably easier to type, but I'd just save the commands to a flash drive connect that do the Ubuntu system, then copy/paste the commands into a terminal or use normal output redirection.

The output ... copy paste that into a new text file, move it back to the internet-connected system, and post here ... wrapped in "code tags" so it is readable.
https://ubuntuforums.org/misc.php?do=bbcode#code explains how to do 'code tags' in these forums.

BTW, running these commands may be even easier and work if you boot into a "Try Ubuntu" environment off the USB flash drive used to perform the installation. Often, networking is fine in that environment even if it isn't ok post-install. The "Try Ubuntu" environment can be used to fix almost any problems with any Ubuntu install, so it is worth knowing and having handy.

[vvons]

I am having same problem, ethernet is not detected in ubuntu 20.04.1. It worked fine in windows.
output of above commads is :
mohit@mohit--System:~$ sudo lshw -C network
*-network
description: Wireless interface
product: Centrino Wireless-N 1030 [Rainbow Peak]
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlp3s0
version: 34
serial: bc:77:37:28:64:41
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.8.0-41-generic firmware=18.168.6.1 6000g2b-6.ucode ip=192.168.1.8 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:36 memory:f1a00000-f1a01fff
mohit@mohit--System:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal
mohit@mohit--System:~$ uname -a
Linux mohit--System 5.8.0-41-generic #46~20.04.1-Ubuntu SMP Mon Jan 18 17:52:23 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
mohit@mohit--System:~$ lspci -vk |egrep --after-context=8 'Ethernet|Network'
03:00.0 Network controller: Intel Corporation Centrino Wireless-N 1030 [Rainbow Peak] (rev 34)
Subsystem: Intel Corporation Centrino Wireless-N 1030 BGN
Flags: bus master, fast devsel, latency 0, IRQ 36
Memory at f1a00000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi

04:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04) (prog-if 30 [XHCI])
mohit@mohit--System:~$ lspci -vk |perl -lne 'print if /Ethernet|Network/ .. /^[\w]*$/'
03:00.0 Network controller: Intel Corporation Centrino Wireless-N 1030 [Rainbow Peak] (rev 34)
Subsystem: Intel Corporation Centrino Wireless-N 1030 BGN
Flags: bus master, fast devsel, latency 0, IRQ 36
Memory at f1a00000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi

[praseodym]

lspci -vk |egrep --after-context=8 'Ethernet|Network'
03:00.0 Network controller: Intel Corporation Centrino Wireless-N 1030 [Rainbow Peak] (rev 34)
Subsystem: Intel Corporation Centrino Wireless-N 1030 BGN
Flags: bus master, fast devsel, latency 0, IRQ 36
Memory at f1a00000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi

Obviously, you have wifi, bot no ethernet?! Please show

lspci -nnk
iwconfig
rfkill list
dmesg | egrep 'firm|iwl'
sudo iwlist scan