你可以先备份当前的Menulist，然后DOS下fdisk /mbr，这样如果不出意外的话可以进入XP，之后在XP下装一个grub for XP（或者直接装个矮人工具箱，装他的话可以自动安装grub在XP的启动里面）。最后在XP下修改装好后的menu.list，使之可以在机器启动的时候通过GRUB来引导Ubuntu。
Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x624aa2e0
Device Boot Start End Blocks Id System
/dev/sda1 * 1 1280 10281568+ c W95 FAT32 (LBA)
/dev/sda2 1281 9729 67866592+ f W95 Ext'd (LBA)
/dev/sda5 1281 3571 18402426 7 HPFS/NTFS
/dev/sda6 3572
Mo Cuishle 0:06:55
6121 20482843+ b W95 FAT32
/dev/sda7 6122 6133 96358+ 83 Linux
/dev/sda8 6134 6257 995998+ 82 Linux swap / Solaris
/dev/sda9 6258 9729 27888808+ 83 Linux
Disk /dev/sdb: 1054 MB, 1054605312 bytes
23 heads, 54 sectors/track, 1658 cylinders
Units = cylinders of 1242 * 512 = 635904 bytes
Disk identifier: 0x02bfca41
Device Boot Start End Blocks Id System
/dev/sdb1 1 1659 1029772+ b W95
-scofield- 于 2008-11-04 00:05:14发表:
# menu.lst - See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.
## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default 0
## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 10
## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
#hiddenmenu
# Pretty colours
#color cyan/blue white/blue
## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive editing
# control (menu entry editor and command-line) and entries protected by the
# command 'lock'
# e.g. password topsecret
# password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret
#
# examples
#
# title Windows 95/98/NT/2000
# root (hd0,0)
# makeactive
# chainloader +1
#
# title Linux
# root (hd0,1)
# kernel /vmlinuz root=/dev/hda2 ro
#
#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below
## DO NOT UNCOMMENT THEM, Just edit them to your needs
## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=4a7e1e3c-6216-45c6-9b8e-b1bb1b576637 ro locale=zh_CN
## default grub root device
## e.g. groot=(hd0,0)
# groot=eb9e2765-3a52-4d98-a6a1-8d46b69fc37e
## should update-grub create alternative automagic boot options
## e.g. alternative=true
## alternative=false
# alternative=true
## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
## lockalternative=false
# lockalternative=false
## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash
## should update-grub lock old automagic boot options
## e.g. lockold=false
## lockold=true
# lockold=false
## Xen hypervisor options to use with the default Xen boot option
# xenhopt=
## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0
## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
## altoptions=(recovery) single
# altoptions=(recovery mode) single
## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
## howmany=7
# howmany=all
## should update-grub create memtest86 boot option
## e.g. memtest86=true
## memtest86=false
# memtest86=true
## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false
## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false
title Ubuntu 8.10, kernel 2.6.27-7-generic (recovery mode)
uuid eb9e2765-3a52-4d98-a6a1-8d46b69fc37e
kernel /vmlinuz-2.6.27-7-generic root=UUID=4a7e1e3c-6216-45c6-9b8e-b1bb1b576637 ro locale=zh_CN single
initrd /initrd.img-2.6.27-7-generic
title Ubuntu 8.10, memtest86+
uuid eb9e2765-3a52-4d98-a6a1-8d46b69fc37e
kernel /memtest86+.bin
quiet
### END DEBIAN AUTOMAGIC KERNELS LIST
# This is a divider, added to separate the menu items below from the Debian
# ones.
title Other operating systems:
root
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
title Microsoft Windows XP Professional
root (hd0,0)
savedefault
makeactive
chainloader +1
-scofield- 于 2008-11-05 12:56:11发表:
11楼的意见很好阿，我会摸索一下的，只是我机子上还有企业5，企业5里的东西重要，目前我还别的东西来备份，挺郁闷的，
deepwhite 于 2008-11-04 12:57:54发表:
提个建议：
你可以先备份当前的Menulist，然后DOS下fdisk /mbr，这样如果不出意外的话可以进入XP，之后在XP下装一个grub for XP（或者直接装个矮人工具箱，装他的话可以自动安装grub在XP的启动里面）。最后在XP下修改装好后的menu.list，使之可以在机器启动的时候通过GRUB来引导Ubuntu。
这样，Linux的启动顺序变成了 C:\boot.ini===》 grub ===》》Ubuntu.
而XP则可以直接由boot.ini来启动。
不知道我说明白了没有。
这样做应该可以，但是如果你更新内核以后需要重新设置menu.list，否则会仍然启动旧的内核。
[ 本帖最后由 deepwhite 于 2008-11-4 12:59 编辑 ]
-scofield- 于 2008-11-04 12:18:01发表:
看来ubuntu确实存在一些问题的，尤其是一些linux上通用的东西被修改确实很令人费解，看来要换别 的版本或者别的系列了，
editwork 于 2008-11-04 10:25:33发表:
不知道你看过一篇攻击ubuntu的文章没有，针对你的这种情况我也遇上过，最终不但ub启动不起来，xp也启动不起来，我跟你一样装的是深度的8.1
攻击的那个文章说到过这个情况。看这篇 《猛文:Greg Kroah-Hartman评Ubuntu Linux发行版》，就我本人遇到的情况来看，这篇文章说的不无道理，可能我的猜想有点偏激，不过没有合理的解释呀。
http://www.cnbeta.com/articles/65893.htm
我的做法是重修mbr，重装深度9.0F，等待ub的8.1发布再重新安装。我的ub里没有什么资料。资料全放在网盘上了。
[ 本帖最后由 editwork 于 2008-11-4 10:28 编辑 ]
tmsdsp 于 2008-11-04 06:39:02发表:
从menu.lst文件中看都很正常，我怀疑是C盘引导扇区（不是MBR）被破坏。但不能完全肯定。
不管如何，你现在最好把重要数据备份出来，而且是双份。
[ 本帖最后由 tmsdsp 于 2008-11-4 07:00 编辑 ]
-scofield- 于 2008-11-04 00:09:39发表:
中间的 Mo Cuishle 0:06:55是多余信息，
-scofield- 于 2008-11-04 00:08:23发表:
Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x624aa2e0
Device Boot Start End Blocks Id System
/dev/sda1 * 1 1280 10281568+ c W95 FAT32 (LBA)
/dev/sda2 1281 9729 67866592+ f W95 Ext'd (LBA)
/dev/sda5 1281 3571 18402426 7 HPFS/NTFS
/dev/sda6 3572
Mo Cuishle 0:06:55
6121 20482843+ b W95 FAT32
/dev/sda7 6122 6133 96358+ 83 Linux
/dev/sda8 6134 6257 995998+ 82 Linux swap / Solaris
/dev/sda9 6258 9729 27888808+ 83 Linux
Disk /dev/sdb: 1054 MB, 1054605312 bytes
23 heads, 54 sectors/track, 1658 cylinders
Units = cylinders of 1242 * 512 = 635904 bytes
Disk identifier: 0x02bfca41
Device Boot Start End Blocks Id System
/dev/sdb1 1 1659 1029772+ b W95
-scofield- 于 2008-11-04 00:05:14发表:
# menu.lst - See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.
## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default 0
## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 10
## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
#hiddenmenu
# Pretty colours
#color cyan/blue white/blue
## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive editing
# control (menu entry editor and command-line) and entries protected by the
# command 'lock'
# e.g. password topsecret
# password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret
#
# examples
#
# title Windows 95/98/NT/2000
# root (hd0,0)
# makeactive
# chainloader +1
#
# title Linux
# root (hd0,1)
# kernel /vmlinuz root=/dev/hda2 ro
#
#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below
## DO NOT UNCOMMENT THEM, Just edit them to your needs
## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=4a7e1e3c-6216-45c6-9b8e-b1bb1b576637 ro locale=zh_CN
## default grub root device
## e.g. groot=(hd0,0)
# groot=eb9e2765-3a52-4d98-a6a1-8d46b69fc37e
## should update-grub create alternative automagic boot options
## e.g. alternative=true
## alternative=false
# alternative=true
## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
## lockalternative=false
# lockalternative=false
## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash
## should update-grub lock old automagic boot options
## e.g. lockold=false
## lockold=true
# lockold=false
## Xen hypervisor options to use with the default Xen boot option
# xenhopt=
## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0
## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
## altoptions=(recovery) single
# altoptions=(recovery mode) single
## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
## howmany=7
# howmany=all
## should update-grub create memtest86 boot option
## e.g. memtest86=true
## memtest86=false
# memtest86=true
## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false
## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false
## ## End Default Options ##
title Ubuntu 8.10, kernel 2.6.27-7-generic
uuid eb9e2765-3a52-4d98-a6a1-8d46b69fc37e
kernel /vmlinuz-2.6.27-7-generic root=UUID=4a7e1e3c-6216-45c6-9b8e-b1bb1b576637 ro locale=zh_CN quiet splash
initrd /initrd.img-2.6.27-7-generic
quiet
title Ubuntu 8.10, kernel 2.6.27-7-generic (recovery mode)
uuid eb9e2765-3a52-4d98-a6a1-8d46b69fc37e
kernel /vmlinuz-2.6.27-7-generic root=UUID=4a7e1e3c-6216-45c6-9b8e-b1bb1b576637 ro locale=zh_CN single
initrd /initrd.img-2.6.27-7-generic
title Ubuntu 8.10, memtest86+
uuid eb9e2765-3a52-4d98-a6a1-8d46b69fc37e
kernel /memtest86+.bin
quiet
### END DEBIAN AUTOMAGIC KERNELS LIST
# This is a divider, added to separate the menu items below from the Debian
# ones.
title Other operating systems:
root
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
title Microsoft Windows XP Professional
root (hd0,0)
savedefault
makeactive
chainloader +1
tmsdsp 于 2008-11-03 16:40:56发表:
请问楼主，能把 menu.lst 贴上来吗？
-scofield- 于 2008-11-03 13:47:51发表:
能回答这个问题的看来还真要个资深的！？难道要我失望不成
-scofield- 于 2008-11-03 13:30:36发表:
谁要是能解决这个问题，我就送上KISS一个，但是方法要尽量简单，什么重装GRUB之类的不行，系统已经又重装了一遍，结果一样，