Help : Fail to install GRUB during Crunchbang Install :/

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http://crunchbanglinux.org – Hi,I am trying to install Crunchbang stable on my old computer (I boot the iso image from a hard drive, [sdb1] because the CD drive is dead, and I can't boot from USB). But it fails every time I try to install GRUB or LILO. And I can't finish the install. I'm lost :(. What should I do ? ThanksPS: I also tried crunchbang testing... same result. (HowTos)