This report is now over 3 year old. Is this still a problem with the current images [0] and if it is could you please try with grub2 instead of grub-legacy?
[0] http://www.debian.org/devel/debian-installer/ -- Felix Zielcke -- To UNSUBSCRIBE, email to debian-boot-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
