To forget the password for the root of the Linux system Superuser, you need to enter the standalone mode:
Restart the system, while reading the second, press E to enter grub mode;
Select Current system, press E to edit, you can see as shown:
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Select the line beginning with kernel and press E to enter edit mode;
At the cursor, write 1 and press ENTER:
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Press B to enter stand-alone mode, and then change the root password.
This article is from the "Shark without bladder" blog, please be sure to keep this source http://lanshark.blog.51cto.com/9594449/1773875
Linux enters standalone mode to change root password