1. Press any key in the boot system for 3 seconds to enter the Grub menu option
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2, press the E key to enter, select the kernel
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3. Press the E key again to enter the command mode, enter init 1 or single return
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4, return to the Kernel interface press the B key to start the system to single user mode
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5. Reset the root password by using the passwd command to restart both
About password reset after forgetting your Linux password