I have a MacBook, 1st generation, and for some reason it will not install OS X Leopard, but will install Ubuntu.
I thought of the obvious first, that my Leopard disc is scratched so I used my Tiger recovery Discs which have never been used or out of their packaging and the MacBook wouldn't install Tiger either.
It always gets about 90% complete and tells me that there were errors and to try again, but like I said it will install Ubuntu no problem.
Any Ideas?
How much memory do you have in the MacBook? Did you upgrade the memory? If so, what brand? If you still have your original memory sticks that came with the computer, I suggest popping those in, and trying to install Leopard from there. Or, if you did upgrade the memory, take one of the sticks out, and try installing from there. You might have a faulty memory module.
I remember I had this problem with my old PowerBook G4. PowerPC Macs were much more pickier about RAM than Intel systems. AND Leopard is also pickier about RAM for whatever reason. The reason I know this is because I was able to install Tiger on the PowerBook, but then when I tried to install Leopard, it would either freeze, or it would go up to a certain point (say 50%, or 90% like you), and tell me installation failed. When I took out one of the memory modules (I had a pair of 1GB sticks), I was able to install Leopard! To my surprise, I redid the installation with just the stick that I took out, and guess what? Went up to whatever percent, and told me installation failed.
Anyway, I suggest you try this first. Ubuntu will install probably because it's not as picky about RAM, even if it's defective.
Or, if it is indeed your combo drive, maybe you should try creating a separate partition on your HD in Disk Utility, and then clone the install DVD onto the new partition. Then boot from that partition, and see if you can install Leopard from there (BTW it'll be much faster than installing from the DVD).