Ubuntu uses U disk to boot to fix MBR

U disk boot modified MBR (in fact, the so-called correction is to delete the MBR in the grub, with 98 of the disc, DOS boot floppy disk generally boot to Dos after the problem.) ）

Look at the U disk boot dos, DOS prompt is C or a, if it is C, you fdisk is not actually on the hard drive operation, but on the U disk, if the hint is a disk, you go into the C disk is not hard disk content, if it is, generally can be successful.
Of course, fix the hard disk MBR, you can also use the XP CD to boot, select the Recovery Console (more detailed content can be found under Google Keyword: Recovery Console).

Fixboot C:

Prompt action

Fixmbr

Prompt action

After installing Windows XP 2000 on Ubuntu (Reload win is the same), the original grub boot was destroyed by win, in fact, has reached the Fdisk effect. This is the time to implement Ubuntu startup.

Can download a grldr file, http://www.aliyun.com/zixun/aggregation/18479.html "> download address is:

http://download.gna.org/grub4dos/

The name with CHS is Chinese version, download an decompression is.

On C (Windows system disk), add a line to C:\Boot.ini in C:\grldr= "Ubuntu"

Can be implemented by the Ntloader boot, through the grub4dos boot Ubuntu.

As long as this is the case, it works for most situations because GRLDR automatically search Ubuntu's boot

If this simple method is not valid, you need to refer to the solution of the Forum's top posts: one is to reload grub to let grub boot win and Ubuntu, the other is to reload grub and then DD, allowing Ntloader to boot win and Ubuntu.

DVD with the software is more rich, for the internet inconvenience to friends more useful
The following is the idea of adding a DVD ISO file as a source (Kubuntu also applies):
Suppose ubuntu-x.04 (x.10)-dvd-i386.iso in your home directory
After opening the terminal

sudo mkdir/media/cdrom0 #如果有cdrom0目录, this step skips
sudo mount-t iso9660-o loop ubuntu-x.04 (x.10)-dvd-i386.iso/media/cdrom0/
sudo apt-cdrom-m-d/media/cdrom0 add
sudo apt update

Again to the new, you can see just add the CD source, want to install what directly after the application on the hook can be. Of course, you can apt installation in the terminal.