Grub
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Grub2
Example for a /etc/grub.d/ file (for kubuntu on /dev/sda10) [1]:
> vim /etc/grub.d/kubuntu
#! /bin/sh -e
echo "Adding Kubuntu Karmic" >&2
cat << EOF
menuentry "kubuntu" {
set root=(hd0,10)
chainloader +1
}
EOF
Reload the configuration an write grub2 files:
> sudo grub-mkconfig -o /boot/grub/grub.cfg