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Update: Ubuntu 12.04 LTS has this package in the main repository.
I made a netatalk 2.2.1 backport for Ubuntu 11.04 amd64 so I could use OS X Lion with Time Machine. Although this was a simple backport, I had previously built a version of the 2.2.0 release that required slightly more interesting packaging steps as it needed a patch or two. The packages resulting from that exercise are now superseded, but the documentation of the process is probably still useful: see the original page on netatalk 2.2.0 for more information.