Modify /etc/grub.d/40_custom
sudo nano /etc/grub.d/40_custom
Add these lines.
menuentry 'Bliss OS' {
set android=/bliss
insmod all_video
search --set=root --file $android/kernel
linux $android/kernel root=/dev/ram0 SRC=$android DATA/data GPU_OVERRIDE=card0 nouveau.modeset=0
initrd $android/initrd.img
}
Update grub
sudo grub-mkconfig -o /boot/grub/grub.cfg