Does anyone know how to get around this? I get persistent GRUB failure, Error 15. I have tried several times to reload the GRUB loader, using RH9 disks and also Ubuntu (the latter does not have any way to install GRUB without committing to partitioning), but despite apparent success during the process, it always returns the same error.

Query: should I try Lilo? I must have the ability to boot to either OS.