Network Connection not working with Ubuntu 24.04.2 and Realtek r8125 Ethernet/WiFi

q-undertow · April 13, 2025, 7:28pm

This definitely answers the specific question I was trying to help with: the driver is r8125. No doubt about it at all.

Sadly I have no answers for the next questions, ie. what is wrong with that driver or (as I suspect without much hard evidence) if your actual problem is at higher level.

jimbobstpaul · April 15, 2025, 3:36am

I found at least one way to get my RTL8125 to work. Here is a fairly long explanation; I hope you find something useful in it:

[ Realtek RTL8125 Ubuntu 24.04 Ethernet Fix -- r8125 new driver; purge r8125-dkms ]

IHTH

Jim

jimbobstpaul · April 16, 2025, 3:41am

Jonathan,

jonathanm9029:

lspci -k
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 0c)
	Subsystem: Micro-Star International Co., Ltd. [MSI] RTL8125 2.5GbE Controller
	Kernel modules: r8169, r8125

This report seems to me to show that you have drivers (kernel modules) for two different ethernet interface devices. Do you really have two devices, one that uses the r8169 driver, and another that uses the r8125 driver? If not, I would fix that, but I’m really new at this stuff so maybe I just don’t understand the situation.