Enter single-user mode
The first step: boot, press ENTER at the following interface.
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The second step: Press the E key in this interface .
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The third step, in this interface through the arrow keys to select a second, and then press the e key.
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Fourth Step: Click the SPACEBAR at the cursor, then enter 1 or s, and return.
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Fifth step: Fallback to this interface press the B key to start the system.
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Sixth step: has entered the system.
This article from "Walking Grass machine" blog, declined to reprint!
How Linux Systems Enter single-user mode