xrdp is a package that allows another desktop to connect to another using the rdp desktop software.

Install xrdp on the target desktop.

sudo apt install xrdp

Add a second user since you can’t use the default user. Use -m to create a home directory.

sudo useradd -m john

Give new user sudo access. This is optional, but is nice to have if running root commands.

sudo usermod -a -G sudo john

Set the user’s password.

sudo passwd john

You can now connect from a rdp client to your desktop using username john.