Linux can live without it.
Fine. I tried editing grub using YaST (the config tool for SUSE), so I entered following lines
kernel (hd0,7) /boot/vmlinuz-2.4.27-1-386 root=/dev/hda7
initrd (hd0,7) /boot/initrd-2.4.27-1-386
knowing that hda7 is my debian partition mounted as /home/debian and my SUSE entry in grub looked like this
kernel (hd0,5) /boot/vmlinuz root=/dev/hda5
initrd (hd0,5) /boot/initrd
YaST didn't complain about a thing but upon reboot it changed it back to the original; i.e: no Debian
What could be the problem?