I wanted to add set mouse=a to the .vimrc file to add point and click cursor, but the /etc/vim/vimrc file is read-only and won't allow me to edit or delete it. I tried to uninstall and reinstall vim but the .vimrc file remained unchanged.
Additionally when I try to edit it from terminal using
sudo vim /etc/vim/vimrc
it says
Found a swap file by name of 'filename'
Apparently it says I edited the same file twice.