Since I reinstalled my windows xp, the grub was no longer available for my dual booting. I am trying to restore the grub, however not succeeded yet. What I am doing is to boot from the installation CD, and enter the "rescue" session, then I can get a root access shell. Afterwards, I type:

grub-install /dev/sda

where /dev/sda is my harddisk and the partitions are as following:

/dev/sda1 ntfs windows
/dev/sda5 ntfs windows
/dev/sda6 ntfs windows
/dev/sda7 swap
/dev/sda8 /
/dev/sda9 /usr
/dev/sda10 /home
etc...

I always get the error after such a command:
/sbin/grub-install: line 480: test: -gt: unary operator expected
/sbin/grub-install: line 493: test: -eq: unary operator expected
/sbin/grub-install: line 491: expr: command not found
...blam blam blam...
grub>root(hd0,)

Error 12: Invalid device requested
.....

This happens even if I try: grub-install hd0


Please help me with such an annoying thing. Thank you very much in advance!


By the way, my linux is Ubuntu dapper beta1

Try following this link and performing either B4 or B5.