How to restart a frozen Linux System?

Answer:

Try the following two simple methods first:

1. Hold down Ctrl+Alt+Backspace if you are in graphic mode
2. if not work, then hold down "Ctrl+Alt+F1" to get into the shell and use the "reboot" command to reboot

If still not work, do the following:

1. Hold down the Alt and SysRq (Print Screen) keys
2. While holding those down, type the following in order: REISUB
3. You computer will reboot now

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