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GRUB: on the bootloader menu, type [e] to enter edit mode. You will be faced with a list of guided projects. Look for sentence lines similar to the following output:

Kernel / vmlinuz-2.4.18-0.4 ro root=/dev/hda2

Press the arrow key until the line is highlighted, and then press [e]. You can now add single to the space at the end of the text to tell GRUB to boot single-user Linux mode. Press the [Enter] key to make the editing results effective.

You will be taken to edit the mode screen, and from here, press, GRUB will boot single-user Linux mode. After finishing loading, you will be faced with a shell prompt similar to the following:

Sh-2.05#

Now, you can change the root command and type:

Bash# passwd root

You will be asked to retype your password to verify it. When finished, the password will be changed, and you can type reboot at the prompt to reboot; then log in as the root user as usual.

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