如何使用Ubuntu U盘启动盘修复更新后无法启动系统

最近,相信很多使用wubi在Windows下安装Ubuntu的系统更新后无法再进入系统的问题,让人不寒而慄,有很多人为此不得不重装系统。

出现此问题的原因在于更新Ubuntu时选择更新grub组件,以至于把引导区grub破坏,这也是个不小的bug吧???

下面说说如何通过U盘启动盘来修复Ubuntu。当然,你得有个1G以上的U盘,再有,你的主板必须支持U盘启动!

首先,当然是准备一个1G以上容量的U盘,用来制作可启动U盘;

其次,到官网上下载Ubuntu desktop镜像文件。Ubuntu Desktop镜像一般700多兆,从而可以把它写到1G大的U盘上,可以从Ubuntu官网下载10.4的镜像文件。

UltraISO将其写入U盘,制作成可启动的U盘。自作完成后重启电脑,选择从U盘启动。

由于你写入U盘的实际上是个像光盘一样的Ubuntu安装盘,所以进入U盘Ubuntu后,你可以选择不安装而直接试用体验Ubuntu,这也是本方法的关键所在,利用LiveCD,我们可以暂时进入系统,借以修复原有系统!

进入Ubuntu系统后,启动命令终端,输入如下指令,在线安装lilo和mbr:
 
ubuntu@ubuntu:~$ sudo apt-get install lilo
Reading package lists... Done
Building dependency tree      
Reading state information... Done
The following extra packages will be installed:
  mbr
Suggested packages:
  lilo-doc
The following NEW packages will be installed:
  lilo mbr
0 upgraded, 2 newly installed, 0 to remove and 408 not upgraded.
Need to get 413kB of archives.
After this operation, 1,315kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 lucid/main mbr 1.1.10-2 [23.0kB]
Get:2 lucid/main lilo 1:22.8-8ubuntu1 [390kB]
Fetched 413kB in 3s (124kB/s)
Preconfiguring packages ...
Selecting previously deselected package mbr.
(Reading database ... 129801 files and directories currently installed.)
Unpacking mbr (from .../archives/mbr_1.1.10-2_i386.deb) ...
Selecting previously deselected package lilo.
Unpacking lilo (from .../lilo_1%3a22.8-8ubuntu1_i386.deb) ...
Processing triggers for man-db ...
Setting up mbr (1.1.10-2) ...
Setting up lilo (1:22.8-8ubuntu1) ...

WARNING: kernel & initrd not found in the root directory (/vmlinuz & /initrd.img)
WARNING: Do NOT reboot or LILO may fail to boot if your kernel+initrd is large.
WARNING: Please read /usr/share/doc/lilo/README.Debian

ubuntu@ubuntu:~$
 

安装过程中,会得到如下lilo的配置提示,按OK就行了: 

Package configuration
 ┌───────────────────────────┤ Configuring lilo ├────────────────────────────┐
 │                                                                           │
 │ LILO configuration                                                        │
 │                                                                           │
 │ It seems to be your first LILO installation. It is absolutely necessary   │
 │ to run liloconfig(8) when you complete this process and execute           │
 │ /sbin/lilo after this.                                                    │
 │                                                                           │
 │ LILO won't work if you don't do this.                                     │
 │                                                                           │
 │                                  <Ok>                                     │
 │                                                                           │
 └───────────────────────────────────────────────────────────────────────────┘ 
                                                                              
然后使用lilo修复系统:

ubuntu@ubuntu:~$ sudo lilo -M /dev/sda mbr
Backup copy of /dev/sda in /boot/boot.0800
The Master Boot Record of  /dev/sda  has been updated.
ubuntu@ubuntu:~$
 

修复完成,重启系统:

ubuntu@ubuntu:~$ sudo -s -H
root@ubuntu:/home/ubuntu# reboot

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