netinst cannot install grub

[Umarzuki Mochlis]

i'm using netinst for 64-bit squeeze
the hard disk used is WD3200BEVT

problem:
when i came to the grub-installation part, it failed
but i can install grub and boot ubuntu 10.04 on the same hard disk

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Regards,

Umarzuki Mochlis
http://debmal.my