How to create bootable ISO from custom Ubuntu 22.04 Image?

I'm trying to create a custom Ubuntu 22.04 image using the following link . I'm not having luck on the Producing the CD image. I get all the way to the > sudo mkisofs -D -r -V "$IMAGE_NAME" -cache-inodes -J -l -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -o ../ubuntu-9.04.1-desktop-i386-custom.iso . The reason this command doesn't work is because Ubuntu 22.04 doesn't have the isolinux/syslinux installed anymore. I've tried finding other ways to get this to write, but they either use isolinux.bin, or a .img that doesn't exist either. I've tried using the .img in boot/grub/i386-pc/eltorito.img, this causes the below error to occur > xorriso: FAILURE: Cannot find in ISO image: -boot_image ... bin_path='boot/grub/i386-pc/eltorito.img I could use some help on getting this Ubuntu 22.04 custom image to write to a bootable image.