Would you please share your Remmina settings and the ‘Desktop Sharing’ and ‘Remote Login’ tabs are set up on your remote system? I cannot get Remmina to create a connection from one Ubuntu install to another using RDP that is part of GNOME.
Thanks,
Scott
Hi and welcome to Ubuntu Discourse 
It is always better to start your own topic rather than posting in an older one.
The original topic is linked as part of this new one.
Please provide us with some additional details regarding your system setup including Ubuntu version, other operating systems, system specifications such as graphic card and RAM.
Thanks