linux-kernel - Ubuntu 开机提示kernel panic - not syncing: Attempted to kill init!

Question

笔记本本来安装的 ubuntu 14.04 昨天提示可以升级到15.04，然后去通过网络升级。升级完成了三分之二的时候，卡住了，等了一会断电重启，结果悲剧了。
再开机 报错kernel panic - not syncing: Attempted to kill init!。
进不去系统，通过Upan进入安装ubuntu的时候，提示现在系统是ubuntu 15.04。求高手指点有没有什么方法能修复系统。而不是重装系统。如果重装的话，能保留原系统安装的软件和lamp环境吗？
附带一个centos 出现类似问题的解决方法。

Answer 1

I also know how to use a USB flash drive. Another method is to use Chroot. I thinkit should be repairable in this situation. Similar kernel issues have been fixed before:

After the USB flash drive enters the system, you can try:

 sudo mount /dev/sda2 /mnt
 sudo mount --bind /proc /mnt/proc
 sudo mount --bind /sys /mnt/sys
 sudo mount --bind /dev /mnt/dev

The network seems to be set up like this

  cp -L /etc/resolv.conf /mnt/etc/resolv.conf

Finally

 sudo chroot /mnt

Sda2 should be changed to the same disk as Ubuntu.

Then again

 sudo apt-get update
 sudo apt-get upgrade 

Try it