1. Press " e " after booting to enter edit selection, as shown in the figure:
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2. Then press " e " again to enter another selection box:
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3. Select the second item, and then press " e ".
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4. Enter " single " in the back , remember that there is a space, and then press Enter. The following selection box appears again.
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5. At this time, select the second item, and then enter " b ". The command line appears,
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6. At this time, change the password passwd , and then restart reboot