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I am testing dual-boot system and want to generate a boot failure when boot into one of the systems (both are Linux), basically to test grub-reboot function. My question is how to easily modify some files to cause boot failure (should be easily recoverable)? Thanks.

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Edit /boot/grub/grub.cfg and comment out the initrd line from the entry you want to fail. Without the initrd the kernel will panic trying to locate the rootfs by uuid.

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Thanks, will give it a try. –  user276851 Jul 10 at 0:48

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