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Alternatively you can press the key combination <keycombo>
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<keycap>Ctrl</keycap> <keycap>Alt</keycap> <keycap>Del</keycap> </keycombo>
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<keycap>Shift</keycap> <keycap>Power</keycap> </keycombo> on Macintosh
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systems</phrase>. A last option is to log in as root and type one of the
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commands <command>poweroff</command>, <command>halt</command> or