I also downloaded the driver from the realtek website at -interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software but I had to connect my mobile phone via usb and share the internet connection with the desktop in order to download the 2.5G Ethernet LINUX driver r8125 for kernel up to 5.6
Realtek Uefi Undi Driver Download
If you have a fresh install of Ubuntu, the build essentials ar not installed.And because build essentials is an meta-package, you could not download it and put it manualy per usb to ubuntu. But you need this package to build network-kernel-driver, especially you want to install uefi-supported driver. 2ff7e9595c
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