I installed the VIM3_Ubuntu-gnome-focal_Linux-4.9_arm64_EMMC_V0.9.8-201203 img file compiled with the latest source provided by khadas on the vim3 board. And when a wired LAN is connected, the Internet operates normally.
Also, if you connect to Wi-Fi, the Internet is connected normally.
However, if you disconnect the Wi-Fi connection and connect to the Internet using a wired LAN, it does not work.
So I checked the cause. The reason is that dhcp is automatically set in the resolved.conf file when a wifi is connected, but dhcp is not set in the resolved.conf file when a wired LAN is connected.
And I download the VIM3_Ubuntu-gnome-focal_Linux-4.9_arm64_EMMC_V0.9-20200530 file provided by khadas on the vim3 board, operate it, and connect it to the wired LAN. Then, dhcp is set in the resolved.conf file.
I think there is a problem with NetworkManager from ubnuntu’s latest source.
Please recheck these issues.