为了把问题说明白，帖子会比较长，请各位耐心些哈～～
1.打开电脑后，启动界面如下：
Ubuntu, with Linux 2.6.35-28-generic
Ubuntu, with Linux 2.6.35-28-generic (recovery mode)
Ubuntu, with Linux 2.6.35-22-generic
Ubuntu, with Linux 2.6.35-22-generic (recovery mode)
Memory test (memtest86+)
Memory test (memtest86+, serial console 115200)
Microsoft Windows XP Professional (on /dev/sda1)
于是，选择最后一项，之后进入一个空白界面，光标在左上角闪了几下就又跳回这个界面。
2.我到grub.cfg文件的详细内容：
3.输入sudo fdisk -l之后的显示如下：#
# 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 "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
insmod vbe
insmod vga
}
insmod part_msdos
insmod ext2
set root='(hd0,msdos11)'
search --no-floppy --fs-uuid --set 4792df2a-ffb6-44a3-a28d-8408feb4427a
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
load_video
insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(hd0,msdos11)'
search --no-floppy --fs-uuid --set 4792df2a-ffb6-44a3-a28d-8408feb4427a
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
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 ###
menuentry 'Ubuntu, with Linux 2.6.35-28-generic' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos11)'
search --no-floppy --fs-uuid --set 4792df2a-ffb6-44a3-a28d-8408feb4427a
linux /boot/vmlinuz-2.6.35-28-generic root=UUID=4792df2a-ffb6-44a3-a28d-8408feb4427a ro quiet splash
initrd /boot/initrd.img-2.6.35-28-generic
}
menuentry 'Ubuntu, with Linux 2.6.35-28-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos11)'
search --no-floppy --fs-uuid --set 4792df2a-ffb6-44a3-a28d-8408feb4427a
echo 'Loading Linux 2.6.35-28-generic ...'
linux /boot/vmlinuz-2.6.35-28-generic root=UUID=4792df2a-ffb6-44a3-a28d-8408feb4427a ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.35-28-generic
}
menuentry 'Ubuntu, with Linux 2.6.35-22-generic' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos11)'
search --no-floppy --fs-uuid --set 4792df2a-ffb6-44a3-a28d-8408feb4427a
linux /boot/vmlinuz-2.6.35-22-generic root=UUID=4792df2a-ffb6-44a3-a28d-8408feb4427a ro quiet splash
initrd /boot/initrd.img-2.6.35-22-generic
}
menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos11)'
search --no-floppy --fs-uuid --set 4792df2a-ffb6-44a3-a28d-8408feb4427a
echo 'Loading Linux 2.6.35-22-generic ...'
linux /boot/vmlinuz-2.6.35-22-generic root=UUID=4792df2a-ffb6-44a3-a28d-8408feb4427a ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.35-22-generic
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos11)'
search --no-floppy --fs-uuid --set 4792df2a-ffb6-44a3-a28d-8408feb4427a
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos11)'
search --no-floppy --fs-uuid --set 4792df2a-ffb6-44a3-a28d-8408feb4427a
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### 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 5aec8239ec821005
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 ###
Device Boot Start End Blocks Id System
/dev/sda1 * 1 3037 24391602 7 HPFS/NTFS
/dev/sda2 3037 30401 219804353+ f W95 Ext'd (LBA)
/dev/sda5 4048 7782 30000000 7 HPFS/NTFS
/dev/sda6 9417 12992 28716451+ 7 HPFS/NTFS
/dev/sda7 17366 30401 104711638+ 7 HPFS/NTFS
/dev/sda8 3037 4047 8115200 83 Linux
/dev/sda9 7782 9416 13125632 83 Linux
/dev/sda10 12992 13241 1999872 82 Linux swap / Solaris
/dev/sda11 13241 17365 33131520 83 Linux
（windows系统装于硬盘下第一个分区，Ubuntu装于/dev/sda11）
4.使用过的解决方法如下，均无法解决此问题：
(1) sudo update-grup
(2)进入后采用“C”命令运行
[a]root （hd0,0)（显示no such partition）【输入root (hd0,1)后显示为什么ntfs】
chainloader +1
[c]boot
【结果】继续跳回最初的选择界面。
5.本人电脑是上网本，没有光驱，没有启动盘。
希望我把问题说明白了，请各位高手指点呀～～
谢谢啦~~~