Install xrdp server

sudo apt install xrdp

First open a terminal and enter sudo apt-get install xrdp. When that is installed enter sudo nano /etc/xrdp/startwm.sh in the terminal. Make sure the last line looks like this:

. /etc/X11/Xsession

Then go to your home folder, rightclick and select Show hidden. If there is no file named .xsession, create it. If there is a filed named like that, open it and make sure that it looks like this when your done: lxsession -e LXDE -s Lubuntu

Now type sudo service xrdp restart in the terminal to restart xrdp. Now it should work 🙂

Reference : https://askubuntu.com/questions/580415/how-to-remote-desktop-from-windows-to-lubuntu