Then generate the ISO:
mkdir -p iso_build/boot/grub cat > iso_build/boot/grub/grub.cfg << EOF set default="0" set timeout=5 menuentry "My Linux System" linux /boot/vmlinuz root=/dev/sda1 ro quiet initrd /boot/initrd.img
Virtual machines are great for testing, but what happens when you need to take that perfectly configured Linux environment or legacy Windows system and run it on physical hardware? You need a bootable ISO.
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