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 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?