Ctrl + V (paste shortcut) doesn’t work everywhere that you expect it to work.
For example, using noVNC, I really need to paste certain strings that I’ve already copied to clipboard with Ctrl + C.
The program for the job is xdotool.
sudo apt-get install xdotool
Open your keyboard shortcuts tool, on Xfce it’s in Keyboard settings and Application Shortcuts.
sh -c 'sleep 0.5; xdotool type "$(xclip -o -selection clipboard)"'