I have been experiencing an issue with copy paste function on vim editor, Debian 9 Stretch, and later i came into a solution which i would like to share with you my team. If there is anyone experiencing the same can use the below settings to enable the feature again

I created a new file which was not available in the vim conf directory    vim /etc/vim/vimrc.local  and entered the below content

runtime! defaults.vim 
let g:skip_defaults_vim = 1 
set mouse=

Have a try if it might be of any help to you too, if it helps drop us a comment below for others to make use of it

If you face any challenge also you can drop us a comment and we will respond quicker and faster