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.
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.