Im currently running Debian 12, and I want to be able to have Kali Linux as a second option in GRUB. I've already installed the Kali Linux OS (rolling) using debootstrap (sudo debootstrap kali-rolling /mnt/kali http://http.kali.org/kali) and installed kali-linux-core, linux-image-amd64, systemd-sysv, grub-efi-amd64, and os-prober.
I can use it (kind of) from inside the terminal using the following commands:
sudo mount --bind /dev /mnt/kali/dev
sudo mount --bind /proc /mnt/kali/proc
sudo mount --bind /sys /mnt/kali/sys
sudo chroot /mnt/kali
I've already tried sudo update-grub and os-prober and they didn't work.
What can I do to show it in GRUB as another bootable OS?
os-prober, both didn't detect it./bootpartition? If so, were you trying to share it with the Kali? Did you runupdate-grubafter exiting the chroot? (And I hope you didn't rungrub-installin the chroot?)refindbootloader allows for having many distros available for booting easily.