1. install vnc in serverPC and clientPC
sudo apt install x11vnc/bionic
2.start vnc in serverPC
sudo x11vnc -forever -passwd agv
3.install vncViewer in serverPC,start vncViewer
sudo apt install gvncviewer/bionic
sudo vncviewer
无显示器时卡顿的解决办法：
sudo apt-get install xserver-xorg-video-vesa xserver-xorg-video-intel xserver-xorg-video-fbdev