更改Ubuntu 12.04和Windows 7启动顺序

刚安装了双系统，分别是windows7（先）和Ubuntu12.04（后）（非wubi安装),. 默认是Linux启动,通过下面的操作可把windows7改为默认启动系统

启动ubuntu后，在终端中输入：

先备份 sudo cp /boot/grub/grub.cfg /boot/grub/grub.cfg.backup

修改启动列表：sudo gedit /boot/grub/grub.cfg(注意不是sudo gedit /boot/grub/menu.lst,

貌似9.10就改为了grub.cfg）

然后找到

default 0

然后往下看，找你想默认启动的操作系统！修改default 后面的数字，0对应第一个，1对应第二个，依次往下！以下是我的grub.cfg

默认是ubuntu！把0改为4就可以了！(升级内核之后数字酌情修改）

#

# DO NOT EDIT THIS FILE

#

# It is automatically generated by /usr/sbin/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

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

}

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

if loadfont /usr/share/grub/unicode.pf2 ; then

set gfxmode=640x480

insmod gfxterm

insmod vbe

if terminal_output gfxterm ; then true ; else

# For backward compatibility with versions of terminal.mod that don't

# understand terminal_output

terminal gfxterm

fi

fi

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

set locale_dir=($root)/boot/grub/locale

set lang=zh

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，Linux 2.6.32-21-generic' --class ubuntu --class gnu-linux --class gnu --class os {

recordfail

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

linux /boot/vmlinuz-2.6.32-21-generic root=UUID=0ee185d8-a603-4309-97b7-6440643becb7 ro quiet splash

initrd /boot/initrd.img-2.6.32-21-generic

}

menuentry 'Ubuntu，Linux 2.6.32-21-generic (恢复模式)' --class ubuntu --class gnu-linux --class gnu --class os {

recordfail

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

echo '载入 Linux ...'

linux /boot/vmlinuz-2.6.32-21-generic root=UUID=0ee185d8-a603-4309-97b7-6440643becb7 ro single

echo '载入引导虚拟磁盘 ...'

initrd /boot/initrd.img-2.6.32-21-generic

}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_memtest86+ ###

menuentry "Memory test (memtest86+)" {

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

linux16 /boot/memtest86+.bin

}

menuentry "Memory test (memtest86+, serial console 115200)" {

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

linux16 /boot/memtest86+.bin console=ttyS0,115200n8

}

### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###

menuentry "Windows 7 (loader) (on /dev/sda1)" {

insmod ntfs

set root='(hd0,1)'

search --no-floppy --fs-uuid --set 6e40b6ff40b6ccd9

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 ###

→→此处分割←←

上面的自己修改default后面的数字。！··

如果你觉得这样不方便到话，我建议你把win7的那一项剪切到ubuntu前面

也就是这个样子，这样既美观又方便（不用修改default后面的数字）。

#

# DO NOT EDIT THIS FILE

#

# It is automatically generated by /usr/sbin/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

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

}

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

if loadfont /usr/share/grub/unicode.pf2 ; then

set gfxmode=640x480

insmod gfxterm

insmod vbe

if terminal_output gfxterm ; then true ; else

# For backward compatibility with versions of terminal.mod that don't

# understand terminal_output

terminal gfxterm

fi

fi

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

set locale_dir=($root)/boot/grub/locale

set lang=zh

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/30_os-prober ###

menuentry "Windows 7 (loader) (on /dev/sda1)" {

insmod ntfs

set root='(hd0,1)'

search --no-floppy --fs-uuid --set 6e40b6ff40b6ccd9

chainloader +1

}

### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/10_linux ###

menuentry 'Ubuntu，Linux 2.6.32-21-generic' --class ubuntu --class gnu-linux --class gnu --class os {

recordfail

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

linux /boot/vmlinuz-2.6.32-21-generic root=UUID=0ee185d8-a603-4309-97b7-6440643becb7 ro quiet splash

initrd /boot/initrd.img-2.6.32-21-generic

}

menuentry 'Ubuntu，Linux 2.6.32-21-generic (恢复模式)' --class ubuntu --class gnu-linux --class gnu --class os {

recordfail

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

echo '载入 Linux ...'

linux /boot/vmlinuz-2.6.32-21-generic root=UUID=0ee185d8-a603-4309-97b7-6440643becb7 ro single

echo '载入引导虚拟磁盘 ...'

initrd /boot/initrd.img-2.6.32-21-generic

}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_memtest86+ ###

menuentry "Memory test (memtest86+)" {

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

linux16 /boot/memtest86+.bin

}

menuentry "Memory test (memtest86+, serial console 115200)" {

insmod ext2

set root='(hd0,3)'

search --no-floppy --fs-uuid --set 0ee185d8-a603-4309-97b7-6440643becb7

linux16 /boot/memtest86+.bin console=ttyS0,115200n8

}

### END /etc/grub.d/20_memtest86+ ###

### 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 ###

每次更新内核，你都要重新修改这个启动项