Some time ago to try to crack the case, the method does not succeed, try again.
When the system started, press the option to enter the bios in the interface disappears, immediately press esc to enter the following screen, select the second item
The above press the Enter key interface, the interface into the underlying, still select the second item.
The above press e interface into the underlying interface.
We need to find a position above the interface linux at the beginning of the text, the contents of the red box red box below the changed content. (Content server version and the desktop version of the interface above the red box may be different, but are instead content to the red box below.)
The above modifications are complete, prompted by ctrl x plus key combination (or press F10) into the screen below. Enter the command passwd root user to modify the root password. After changing the password is completed, use the reboot / shutdown / init 6 commands are not available, then forced shutdown restart (does not affect the modified code), enter the system with a new password to login.
Reference links:
http://blog.csdn.net/w410589502/article/details/53611974
http://www.cnblogs.com/jefflee168/p/5583456.html
http://blog.csdn.net/lht501692913/article/details/52189873
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