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.