Vim inserting comments while copy pasting

Two main options:

• Put directly from the register without ever entering insert mode, using  "+p
  
  • " means "use the following register";
  • + refers to the clipboard, and
  • p for put!

Should you be using the middle click selection paste in Linux, use * instead of + to refer to it.

• Before entering insert mode to paste, run :set paste. Turn it off once you leave insert mode with :set nopaste.

In Vim go to the mode :set paste. Then press Ctrl + Shift + V.

It would work.

Don't paste by going to edit and paste. It won't work.

Everybody so far is missing the point. Vim is automatically inserting the comment field when you start a new line (whether it is from a paste or from your typing).

You have formatoptions set with at least the r and maybe the o option. To see your settings, type

:set formatoptions?

To remove those options, type

:set formatoptions=

Paste will then work the way you expect.

Type

:help fo-table

to see what the letters in formatoptions each mean.