Single-User mode

It is similar to the security mode of Windows, you can go into this mode to do some operations, it is in this mode just start some very critical services, many services it is not started, the most common one usage in single-user mode to change the root password, if the grub password is not set.

How to enter single-user mode:

Reboot the system and press any key within 3 seconds to enter this interface

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Next press E, use the arrow keys to select the 2nd, and then press E to edit,

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At the end of that line add 1 or single or S or S, and finally enter

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Then press B, that is, start without entering the user name password

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In this mode you can use the passwd command to change the password (if previously forgotten), set the new password, and then restart

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After restarting, you can enter your username and password

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Single-User mode