If Debian boots using GRUB, then when the boot menu comes up you can type c to get to the GRUB command line. You can then use the root, kernel, and if needed initrd commands to specify how to boot to Ubuntu, and then issue the boot command to actually do it. Once in Ubuntu, I think you can, as root type
grub-install /dev/hda
to reinstall Ubuntu's GRUB. However, I would strongly advise you to check the grub-install man pages before doing this.
EDIT: If you don't know what parameters to use with GRUB commands, mount the relevant Ubuntu partition while in Debian and look at what Ubuntu's menu.lst file shows for booting Ubuntu.
Last edited by blackhole54; 12-22-2006 at 09:20 PM.
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