As of Ubuntu 9.04 (aka Jaunty Jackelope), it is no longer necessary to jump through hoops to access files on an Ubuntu (or Debian) server from a Macintosh OS X client via netatalk. More here

Unfortunately, if you’ve previously gone to the trouble of jumping through those hoops by doing a custom compile of netatalk with openssl support , you are likely to run in to problems once you upgrade to Jaunty (and probably the soon to be released v9.10, aka Karmic Koala). Fortunately, the fixes are pretty easy if you’ve managed to find this blog post.