Emacs on Ubuntu: Function documentation lacks link to source code

Question

I use Emacs on Ubuntu at work. One persistent annoyance has been that function documentation does not include a link to the function's source code. For example, on my Ubuntu system the documentation for find-file begins:

find-file is an interactive compiled Lisp function.

On my home machine, the same function is documented like this:

find-file is an interactive compiled Lisp function in `files'.

Clicking on "files" will take me to the function's definition.

How can I get the standard, useful behavior on Ubuntu?

Answer 1

Ubuntu doesn't install the source by default, so there's nothing for it to point to. You need to install the emacs23-el package.