ubunt 16 and 18 slow wired networking

Hi,

I flashed the ubuntu firmware/boot. Just a simple speedtest.net showed 10 Mbps - but the same network cable connected to my desktop pc showed almost 60 Mbps speed. I tried the other os - the best is Android at 16 Mbps. Anyone can help solve the slowness issue? The router is 100 Mbps.

Thanks.

ps. the board is roc-rk3328-cc
I tried the follow images - all showed slow wired networking
ROC-RK3328-CC_Android7.1.2_180411.img
ROC-RK3328-CC_Debian9-Arch64_20180425.img
ROC-RK3328-CC_Ubuntu16.04_Arch64_20180404.img
ROC-RK3328-CC-ubuntu18.04-LXDE_20180605.img

im not sure but see this
https://www.youtube.com/watch?v=JadID7eRTtQ&frags=pl%2Cwn

use this

https://github.com/ssvb/cpuburn-arm

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