Rescuing a Lost Root Password

"Reboot (hard reboot by pulling the power cable if rebooting requires the root password), and hit 'e' to edit the boot line when you get to the grub menu. Scroll down to the line that starts with kernel, then hit 'e' again to edit it, add 'single' to the end, and hit Enter to accept. Now 'b' to boot and eventually you'll be dumped into a root shell. From here type passwd to change the root password."

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