On Tue, 2010-06-15 at 15:27 -0500, Dan Lazewatsky wrote: 
> I've noticed the same thing. Using karmic instead of lucid seems to  
> work fine.

It's not just you. None of the binaries for 10.04 are being built.
http://code.ros.org/packages/ros/ubuntu/dists/lucid/main/binary-i386/

It looks like its a problem with the build scripts or Lucid isn't
supported yet.