Don't know if its worth to mention in this page [1], but when I installed the needed libjack-dev package (towards building pd 0.43 in Ubuntu Maverick 32 bits) it removed jackd2. It seems that they cannot sit together (maybe this should be posted in the jackd mailing list). The simple workaround is to install the jackd1 package, that can live happily alongside the dev one.
Anyway kudos for the wiki maintainers, that how-to is very easy. If you feel that the warning about "jackd2 vs. lib-jackdev" is worth noting, I can edit the page.
Best regards, Pedro
[1] http://puredata.info/docs/developer/UbuntuMaverick