Answer by Gael for Turning off auto indent when pasting text into vim

This issue has already been answered, but I though I could also add my own solution:

If you simply want to disable auto-indent system wise, for every file type (basically, disable the auto-indent feature completely), you can do the following:

1. Backup the indent.vim file:
   sudo mv /usr/share/vim/vim81/indent.vim /usr/share/vim/vim81/indent.vim.orig
2. Create a new empty indent.vim file:
   sudo touch /usr/share/vim/vim81/indent.vim