GRUB Boot config

cd /etc/grub.d
sudo vi 40_custom
menuentry “OS_Name” {
set root=(hd0,1)
chainloader +1
}
Save File
grub2-mkconfig –output=/boot/grub2/grub.cfg
Edit Grub Default
vi /etc/default/grub:
GRUB_DEFAULT=”OS_Name”
~