https://serverfault.com/questions/712928/systemctl-commands-timeout-when-ran-as-root
Failed to start reboot.target: Connection timed out See system logs and ‘sys
Failed to start reboot.target: Connection timed out See system logs and ‘sys
Failed to open /dev/initctl: No such device or address
sudo reboot 不行
sudo shutdown -r -t now 不行
systemctl --force --force reboot
---Ubuntu 16.04 server 不能关机问题解决
原文：https://www.cnblogs.com/bzhao/p/10768633.html