I tried yank to clipboard from vim.
But it does not do it.
I've attempted with "+y (also, I tried "*y)after select copy area in Visual Mode.
But does not paste copied content when I Ctrl-Shift-V typed on terminal.  
Why it does not paste in terminal despite I yanked to special register?
clipboard and xterm_clipboard  features are enabled in my vim.  
I using
- Vim 8.1 patch 1-320
 - Ubuntu 19.04
 - Virtualbox 6.0.12