New dual-boot install: Cannot boot Ubuntu

[Dotan Cohen]

I just installed Kubuntu 9.10 on a machine that dual-boots Windows XP.
The machine has two IDE drives, this is the partition layout:

sda1: 160 GB: shared FAT32 partition. In Windows: F:, in Ubuntu: /media/shared
sdb1: 30 GB: Windows XP C:
sdb2: 2 GB: swap
sdb3: 48 GB: Kubuntu 9.10

Even though C: is on sdb, the BIOS was configured to boot from sda
(confirmed to to device names and sizes). Therefore, I installed Grub
on sda. However, when I restart the machine after install, Grub did
not come up and the machine booted into Windows. Therefore, I
configured the BIOS to boot from sdb in the hopes that maybe I made a
mistake and installed Grub there. However, the machine _still_ booted
into Windows!

I therefore reinstalled and this time installed Grub to sdb. However,
no matter if the BIOS is configured to boot from sda or sdb, it always
boots Windows from sdb1!

What must I do to diagnose and repair this? Thanks!

-- 
Dotan Cohen

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