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RealTek Ethernet interface won't work on new Ubuntu Server 20.04 install

ng flag

I have seen a question like the one I am going to ask. I have referenced all the steps in this post: Can't get RTL8125B working on 20.04

I am newish to Linux and new for sure with Ubuntu.

I did the following command:

$ dmesg | grep -i r8169
[    1.150265] r8169 0000:04:00.0: unknown chip XID 641

I have downloaded the RealTek drivers and I am running into the same make errors. Since I don't have network access, I can't install the essentials packages and others to that will allow me to build the driver.

I am running on a ASUS TUFF B450M-PRO S motherboard. Fresh install of Ubuntu Server 20.04 from a USB stick. During the build, the install clearly can't find the driver and asks me to continue the install without checking for updates.

Any idea on how I can get network access without having network access to get the packages I need? Output from lspci:

lspci -knn | grep Eth 
04:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8125 2.5Gbe Controller [10ec:8125] (rev 04)

Thanks for any help/idea's in advance.

David avatar
cn flag
Of course it asked you to continue without updates you said you never had internet access. Not finding a driver may or MAY not be why it asked. If you do not have internet access how do you expect to fix this?
Lance avatar
ng flag
That is the problem that I have to solve. My windows machine and Raspi all have network access just not this server. I bought a usb network adapter to see if the server install can use that to get me connected so I can download the needed packages. Otherwise I am looking at dual booting to desktop ( which finds the network adapter and has internet access) to download the needed packages to build the driver on the server.
Lance avatar
ng flag
Update, I was able to use the usb wifi adapter to get temp internet access and finish the install. I was able to download the "build-essentials" package and successfully get the correct driver. I looked up a couple additional posts to help with finishing the configuration of the eth adapter. I will have to see if the next time the kernel is patched if it will break the work that I have done. Thanks for all the help and great forum.
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