I put 'start' in ~/.vimrc, and my vim starts in input mode.
I put 'start' in /etc/vimrc, and nothing happens, for any user, including root.
How do I fix this?
UPDATE:
per queueoverflow below, I consulted :help system-vimrc, which I interpreted to mean that the most common path is indeed /etc/vimrc but the system is actually computing that from $VIM/vimrc.
echo $VIM produces blank output for both a normal user and for root.
This is a fresh Ubuntu 10.04 LTS installation, did I do something wrong?
I installed vim with sudo apt-get install vim.

:help system-vimrc. From serverfault.com/questions/82626/how-to-make-a-global-vimrc – queueoverflow Sep 4 '11 at 21:43