I have tried to set the tramp-default-user-alist in .emacs with both emacs21/emacs22 on Ubuntu, but kept getting the following error:
Finally, I started grep'ing out tramp-default-user-alist in the tramp*.el files, but couldn't find it defined (tramp-version == 2.0.55). Next, I downloaded the newest tramp from Savannah, and found that tramp-default-user-alist was indeed defined, (tramp-version == 2.1.10). My fix was to compile version 2.1.10 which now loads into emacs22, and now my void-variable error is a thing of the past... :)
With a little side of applesauce...
©2006 Shannon Eric Peevey