The magic SysRq key is an old tip to be used to recover from a frozen system, it is advised to be used when the system absolutely locks up - freeze, and when using Ctrl+Alt+Backspace does nothing .
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How to close down GNU/Linux safely after a system freeze with the SysRq key | Free Software Magazine
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Despite jeering at Windows for the infamous system freezes and blue screens of death, there are and will be times when your computer just locks up: the cursor is frozen and even invoking a console by Ctrl + Alt + [F2, F3, ...] to close down the X windows session running on F7 is non-functional.
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