Stale links in Info tree?

[rmcd]

I have a number of non-existent entries in my info tree (C-h i). The stale 
entries refer to "emacs22" (e.g., "Autotype (emacs22)" ). I can't figure out 
where they are or even where the tree is originating. I've been using emacs 
23.1 (Ubuntu 10.04) and just upgraded to 23.2 (via a ppa). The incorrect links 
existed in both versions.

C-x C-f points me to /usr/share/info. The dir file there is not what is 
displayed in emacs. So I'm puzzled. I don't know how to find the file emacs is 
loading and I don't know how to refresh it to get rid of the non-existent 
links.  Most topics seem linked correctly. It is just the "emacs22" entries 
that point to non-existent files.
 
Thanks for any help.