To remote control another machine Ubuntu 18.04 in LAN from Windows 10, you can use Remote Desktop Connection.
Desktop Sharing.Screen Sharing.Allow connections to control the screen.Require a password.
sudo apt install dconf-editor
dconf-editor # launch it
require-encryption.Connect,
Computer: 192.168.1.100
Username: yui
Session: vnc-any
ip: 192.168.1.100
port: 5900
password: [you set before]
OK.Sometimes, RDP Client in Windows does not work that well with vnc. You can install tinyVNC viewer installed in Windows, or Remmina default in Ubuntu.