When I use remote desktop from windows 10 to Lububtu 20.04 running xrdp I get a blank screen with just the bar on the bottom. It connects very quickly with no errors, but not usable.
I did not keep the site address so I am not able to credit the smart person.
To fix xrpt from Windows
To solve this “second session” problem and allow as many sessions as you need, edit /etc/xrdp/startwm.sh and add these lines before the lines that test and execute Xsession. The $HOME/.profile is not part of the solution, but is something that should be run before starting the session anyway.