Vncserver on ubuntu 20.04 not connect from vncclient

Which Khadas SBC do you use?

vim3

Which system do you use? Android, Ubuntu, OOWOW or others?

Ubuntu

Which version of system do you use? Khadas official images, self built images, or others?

Please describe your issue below:

I can stablish connection for vncserver but not connect from vncclient. Perhaps I need to downgrade ubuntu’s version?
I’m following instructions from this post I’m following instructions from this topic

Post a console log of your issue below: