Debian emergency shutdown

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The following tutorial describes how to emergency shutdown Debian when it does not respond to shutdown -r now.
When we issue the command

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shutdown -r now

and we get the result:

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2
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Failed to start reboot.target: Activation of org.freedesktop.systemd1 timed out
Failed to open initctl FIFO: Nie ma takiego urządzenia ani adresu
Failed to talk to init daemon.

The way to force a safe shutdown would be:

emergency shutdown:

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echo 1 > /proc/sys/kernel/sysrq

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echo o > /proc/sysrq-trigger

emergency restart:

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echo 1 > /proc/sys/kernel/sysrq

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echo b > /proc/sysrq-trigger

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