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What would be the proper way to make Ubuntu reboot using kexec by default (especially when the reboot is initiated from the GUI)?

I found this kexec reboot script, that when downloaded and run with sudo kexec-reboot -l -r reboots the kernel with kexec (does not go through EFI).

How can I make it so that choosing reboot from a GUI results in a kexec reboot? I am using Unity 7 on Bionic (18.04). It used to work just by installing the package and configuring it with dpkg, but that says it is System-V only and now we are using systemd.

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