Fly Kan 2.5G USB Network Card on Ubuntu 20.04.1 LTS
Fly Kan started their 2.5G USB Network Device (CUG3125 & CUG025). They works well with Realtek's official driver package. The 2 2.5G USB Network Cards supports 2.5G/1G/100Mbps/10Mbps speed-mode. But there requires 2.5G Network swtich as well.
The installation is a rather easy job. However the configuration requires professional Linux background.