Cannot get Remmina to copy and paste from client to server?
Here is the solution:
1) Open Terminal and paste the following code
sudo apt-add-repository ppa:remmina-ppa-team/remmina-next
sudo apt-get update
sudo apt-get install remmina remmina-plugin-rdp
2) Now close Remmina RDP Client and open it again.
Ref: Click