I have a similar issue with XRDP going to a blank screen. The only thing I could find (a few months ago) was that in 18.04 for unknown reasons XRDP doesn't work if the user is already logged on ...
Install XRDP on Ubuntu to enable RDP access for Linux VMs. Open port 3389 and verify IP address for remote connectivity. Use RDP client with Xorg session to manage Linux alongside Windows VMs.
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