From Chen's Wiki
Determine the support
vim --version | grep clipboard
If it shows:
This means you haven't the support for the system clipboard for vim yet.
All you need to do is:
sudo apt-get install vim-gui-common
Once you have the plus sign before xterm_clipboard, this means you can use the + or the * register to access the system clipboard.
To specify the register to use in vim, you do
For example, yanking the current line to the system clipboard:
Copy the system clipboard in vim: