Install XRDP with Mate-desktop-environment in Ubuntu
sudo apt-get install xrdp
sudo apt-get update
sudo apt-get install mate-core mate-desktop-environment mate-notification-daemon
sudo sed -i.bak '/fi/a #xrdp multiple users configuration \n mate-session \n' /etc/xrdp/startwm.sh
Open "Remote Desktop"
Enter the IP of your VPS and Connect
Leave the Session as "Xorg"
Enter your username and password of your VPS
Click "ok"