Ubuntu 啟動失敗：target filesystem doesnt have requested /sbin/init

Ubuntu系統強制按電源鍵關機之後再重新啟動失敗，提示：

1. Killed
3. Mount: mounting /dev on /root/dev failed :no such file or directory
5. Mount: mounting /sys on /root/sys failed :no such file or directory
7. Mount: mounting /proc on /root/proc failed :no such file or directory
9. Target filesystem doesn’t have requested /sbin/init
11. No init found. Try passing init=bootarg
13. BusyBox v1.15.3 (Ubuntu 1:1.15.3-ubuntu5)built-in shell (ash)
15. Enter ‘help’ for a list of built-in commands.
17. (initramfs)_

更多Ubuntu相關信息見Ubuntu 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=2