new Powerbook install problem 5.10

[Steve Calvin]

I can't get the Ubuntu intaller to recognize my cdrom. I get to the  
graphical installer startup, language, location etc., but it asks for  
a floppy(!) with my cdrom driver. It asks me to select a module and  
then what is the /dev/cdrom address of my drive. It says no common  
drive found, or something. I tried /cdrom, /dev/ptmx, /dev/cdrom- 
which is the default. None work. Any ideas? Is my superdrive cd/dvd  
dual layer too new or?