kexec (reboot without hardware initialization)

echo "kexec-tools kexec-tools/load_kexec select false" | sudo debconf-set-selections
sudo apt install -y kexec-tools
sudo kexec -l /boot/vmlinuz-4.15.0-32-generic --initrd=/boot/initrd.img-4.15.0-32-generic --reuse-cmdline
sudo kexec -e
systemctl kexec