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i still have a problem ,if i want to install ppp-udeb ,how to write my command?
linux /vmlinuz-2.6.32-5-686 append install modules=ppp.udeb
??

grub>insmod part_msdos
grub>insmod ext2
grub>set root='(hd1,msdos5)'
grub>linux /vmlinuz-2.6.32-5-686 \root=UUID=a28fd0a3-5391-4ac5-8206-3c97e53dc605 rootdelay=60 ro quiet
grub>initrd...

i have separate '/boot' partition and '/' partition.

it's so strange for my system ,i can boot it with my rescue cd,but i can't boot it with my rescue usb,the same grub command
grub>insmod...

i make a rescue grub usb this way .
sudo grub-mkrescue --output=rescue.iso
sudo dd if=~/rescue.iso of=/dev/sdb

my grub.cfg is:

menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-686' --class...