Just reread myself and I think I should clarify.
I checked in the .deb distributed on packages.ubuntu.com and the prereq udev was there.
But, when I downloaded dmraid_0.9.9+1.0.0.rc9-2ubuntu1 through the dapper universe repo, the prereq udev wasn't there. And that was the cause of my trouble.
Just reread myself and I think I should clarify.
I checked in the .deb distributed on packages.ubuntu.com and the prereq udev was there.
But, when I downloaded dmraid_ 0.9.9+1. 0.0.rc9- 2ubuntu1 through the dapper universe repo, the prereq udev wasn't there. And that was the cause of my trouble.