please recheck after a dist-upgrade to dapper 20060414, you should have installed
cupsys 1.1.99.b1.r4929-0ubuntu8
hplip-ppds 0.9.6-1ubuntu8
** Changed in: cupsys (Ubuntu)
Assignee: (unassigned) => Matthias Klose
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cupsys does not automatically detect parallel printer
https://launchpad.net/malone/bugs/29050