i have built a new pc recently, however the 2.5G isn't being picked up by elementary or any ubuntu based distro, any help?
Same problem here. I built a new computer a few days ago using another B550 chipset motherboard. My Gigabyte B550 Aorus Pro V2 also has the Realtek 2.5GbE LAN. I tried Hera 5.1.7 (20200814 build) and did not recognise the network adapter on boot.
I did the steps below and I managed to make it recognise the 2.5GbE controller.
From Realtek official page download the r8125 linux driver. Extract and copy the r8125 driver to your computer with the B550 motherboard.
Install make and gcc packages from the bootable Elementary USB by issuing the command:
$ sudo apt-get install make gcc
After the packages are installed, open a terminal to the directory that contains the extracted drivers and give the command:
$ sudo ./autorun.sh
If everything went well, the drivers should be installed successfully. You can check if the driver is loaded by using the following:
$ lsmod | grep r8125
In my case the output was:
r8125 151552 0
If everything went well, at this point you should have access to the Internet. If not, try to check the README file in the driver's directory for extra guidance.
