[solved] unable to connect RDP session to Ubuntu Server
Not sure if this still requires a solution... as it turns out (after a lot of dicking around on my part, since I was running into the same problem, also with gnome-remote-desktop), you have to edit the entry for the linux server in Remote Desktop Manager. Advanced tab --> change RDP version to "RDP (FreeRDP Latest)".
The windows remote desktop client obviously falls back to this protocol without prompting/notifying.
Cheers!
@admin36
just popped in here to confirm this worked a treat thank you!!