Wubi是Windows Ubuntu-Based Installer的縮寫，即在windows的分區（NTFS）中虛擬一段磁盤空間，作為獨立於windows的loop分區,作為linux的根目錄/。
使用LVPM（Loopmounted Virtual Partition Manager）可以擴展虛擬磁盤的空間(使用LVMP的resize功能),或者將linux系統從虛擬的磁盤拷貝到真實的分區下，實現真正的windows+linux雙系統。
1.分區
在wubi-Ubuntu下，使用系統自帶的磁盤實用工具，建議將空白的分區分出一個linux下的交換分區（SWAP），剩余的作為linux的分區（ext2，ext3或ext4格式）。
下面是磁盤分區之後的數據
administrator@ubuntu:~$ sudo fdisk -l
[sudo] password for administrator: Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000001
Device Boot Start End Blocks Id System
/dev/sda1 * 1 1275 10241406 7 HPFS/NTFS
/dev/sda2 1276 1397 979965 82 Linux swap / Solaris
/dev/sda3 1398 6123 37961595 83 Linux
/dev/sda4 6124 38913 263385675 f W95 Ext'd (LBA)
/dev/sda5 6124 16723 85144468+ 7 HPFS/NTFS
/dev/sda6 16724 27738 88477956 b W95 FAT32
/dev/sda7 27739 38913 89763156 7 HPFS/NTFS
從上面的數據可以看出，主分區從/dev/sda1開始，擴展分區從/dev/sda4開始，第一個擴展分區為/dev/sda5. 不妨再看看分區容量。
administrator@ubuntu:~$ df -lh
文件系統 容量 已用 可用已用%% 掛載點
/dev/sda3 36G 4.1G 30G 12%/
none 999M 328K 999M 1%/dev
none 1004M 348K 1004M 1%/dev/shm
none 1004M 92K 1004M 1%/var/run
none 1004M 0 1004M 0% /var/lock
/dev/sda1 9.8G 4.6G 5.3G 47%/media/SYS
/dev/sda5 82G 75G 7.1G 92% /media/SOFT
/dev/sda6 85G 75G 9.9G 89% /media/WORK
/dev/sda7 86G 81G 4.9G 95% /media/BACK
分區的UUID（Universally Unique Identifier即唯一識別碼）也是應該知道的。
administrator@ubuntu:~$ ls -al /dev/disk/by-uuid
總計 0 drwxr-xr-x 2 root root 160 2011-04-23 01:31 .
drwxr-xr-x 6 root root 120 2011-04-23 01:31 ..
lrwxrwxrwx 1 root root 10 2011-04-22 17:31 15fbe968-a73a-4b14-8315-ae841cf0d048 -> ../../sda3
lrwxrwxrwx 1 root root 10 2011-04-22 17:31 237D-1AF7 -> ../../sda6
lrwxrwxrwx 1 root root 10 2011-04-22 17:31 293d2cc0-614c-4b02-887d-354a29de1220 -> ../../sda2lrwxrwxrwx 1 root root 10 2011-04-22 17:31 9AC4BB30C4BB0D8F -> ../../sda7
lrwxrwxrwx 1 root root 10 2011-04-22 17:31 D028BF0728BEEB9A -> ../../sda5
lrwxrwxrwx 1 root root 10 2011-04-22 17:31 DE305BE6305BC3E5 -> ../../sda1
2.使用LVMP工具的transfer功能。
這一步，LVMP做三件事：格式化目標分區成ext4格式；復制文件；安裝、復制grub。
注意修改\boot\grub 下的grub. cfg 文件
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
}
if [ "${recordfail}" = 1 ]; then
set timeout=-1
else
set timeout=10
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ###
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/10_lupin ###
menuentry "Ubuntu,grub.cfg Linux 2.6.35-22-generic on /dev/sda3" {
insmod part_msdos
insmod ext3
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set 15fbe968-a73a-4b14-8315-ae841cf0d048
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-2.6.35-22-generic root=/dev/sda3 loop=/ubuntu/disks/root.disk ro quiet splash
initrd /boot/initrd.img-2.6.35-22-generic
}
menuentry "Ubuntu,grub.cfg Linux 2.6.35-22-generic on /dev/sda3 (recovery mode)" {
insmod part_msdos
insmod ext3
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set 15fbe968-a73a-4b14-8315-ae841cf0d048
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-2.6.35-22-generic root=/dev/sda3 loop=/ubuntu/disks/root.disk ro single
initrd /boot/initrd.img-2.6.35-22-generic
}
### END /etc/grub.d/10_lupin ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/20_memtest86+ ###
### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Microsoft Windows XP Professional (on /dev/sda1)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set de305be6305bc3e5
drivemap -s (hd0) ${root}
chainloader +1
}
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
在這一步，應該注意，將分區的uuid和路徑改成目標分區（即紅色標注部分）。因為LVPM在復制grub的時候，沒有將分區和路徑改過來。
同時也要修改\boot\grub 下的menu.lst
default=0
timeout=5
title Ubuntu-on-menu.lst/dev/sda3
insmod part_msdos
insmod ext3
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set 15fbe968-a73a-4b14-8315-ae841cf0d048
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-2.6.35-22-generic root=/dev/sda3 loop=/ubuntu/disks/root.disk ro quiet splash
kernel /boot/vmlinuz-2.6.35-22-generic ro root=/dev/sda3
initrd /boot/initrd.img-2.6.35-22-generic
# This is a divider, added to separate the menu items below from the Debian
# ones.
title Other operating systems:
root
title UnknownOS
root (hd0,4)
makeactive
chainloader +1
boot
title Microsoft Windows XP Professional
root (hd0,0)
makeactive
chainloader +1
boot
