修改Ubuntu启动菜单使windows XP/Vista/win 7变为默认启动系统

很多朋友在电脑上装了Windows和ubuntu双系统，电脑是一个人用的还好；假如是公用的，其他用户在启动时看到多系统启动界面会不知所措，对于自己而言，这样的启动也会给自己浪费很多时间。所以，将默认启动的系统改为Windows是很有必要的。

在ubuntu系统中打开终端，输入：sudogedit/boot/grub/menu.lst

这时会弹出文本编辑器，内容如下：

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#menu.lst-See:grub(8),infogrub,update-grub(8)

#grub-install(8),grub-floppy(8),

#grub-md5-crypt,/usr/share/doc/grub

#and/usr/share/doc/grub-doc/.

##defaultnum

#SetthedefaultentrytotheentrynumberNUM.Numberingstartsfrom0,and

#theentrynumber0isthedefaultifthecommandisnotused.

#

#Youcanspecify'saved'insteadofanumber.Inthiscase,thedefaultentry

#istheentrysavedwiththecommand'savedefault'.

#WARNING:Ifyouareusingdmraiddonotchangethisentryto'saved'oryour

#arraywilldesyncandwillnotletyoubootyoursystem.

default0

##timeoutsec

#Setatimeout,inSECseconds,beforeautomaticallybootingthedefaultentry

#(normallythefirstentrydefined).

timeout10

##hiddenmenu

#Hidesthemenubydefault(pressESCtoseethemenu)

#hiddenmenu

#Prettycolours

#colorcyan/bluewhite/blue

##password['--md5']passwd

#Ifusedinthefirstsectionofamenufile,disableallinteractiveediting

#control(menuentryeditorandcommand-line)andentriesprotectedbythe

#command'lock'

#e.g.passwordtopsecret

#password--md5$1$gLhU0/$aW78kHK1QfV3P2b2znUoe/

#passwordtopsecret

#

#examples

#

#titleWindows95/98/NT/2000

#root(hd0,0)

#makeactive

#chainloader+1

#

#titleLinux

#root(hd0,1)

#kernel/vmlinuzroot=/dev/hda2ro

#

#

#Putstaticbootstanzasbeforeand/orafterAUTOMAGICKERNELLIST

###BEGINAUTOMAGICKERNELSLIST

##linesbetweentheAUTOMAGICKERNELSLISTmarkerswillbemodified

##bythedebianupdate-grubscriptexceptforthedefaultoptionsbelow

##DONOTUNCOMMENTTHEM,Justeditthemtoyourneeds

####StartDefaultOptions##

##defaultkerneloptions

##defaultkerneloptionsforautomagicbootoptions

##Ifyouwantspecialoptionsforspecifickernelsusekopt_x_y_z

##wherex.y.ziskernelversion.Minorversionscanbeomitted.

##e.g.kopt=root=/dev/hda1ro

##kopt_2_6_8=root=/dev/hdc1ro

##kopt_2_6_8_2_686=root=/dev/hdc2ro

#kopt=root=UUID=2d1136cb-416a-4329-8c6d-703537a2d578ro

##Setupcrashdumpmenuentries

##e.g.crashdump=1

#crashdump=0

##defaultgrubrootdevice

##e.g.groot=(hd0,0)

#groot=(hd0,7)

##shouldupdate-grubcreatealternativeautomagicbootoptions

##e.g.alternative=true

##alternative=false

#alternative=true

##shouldupdate-grublockalternativeautomagicbootoptions

##e.g.lockalternative=true

##lockalternative=false

#lockalternative=false

##additionaloptionstousewiththedefaultbootoption,butnotwiththe

##alternatives

##e.g.defoptions=vga=791resume=/dev/hda5

#defoptions=quietsplashlocale=zh_CN

##shouldupdate-grublockoldautomagicbootoptions

##e.g.lockold=false

##lockold=true

#lockold=false

##XenhypervisoroptionstousewiththedefaultXenbootoption

#xenhopt=

##XenLinuxkerneloptionstousewiththedefaultXenbootoption

#xenkopt=console=tty0

##altoptionboottargetsoption

##multiplealtoptionslinesareallowed

##e.g.altoptions=(extramenusuffix)extrabootoptions

##altoptions=(recovery)single

#altoptions=(recoverymode)single

##controlshowmanykernelsshouldbeputintothemenu.lst

##onlycountsthefirstoccurenceofakernel,notthe

##alternativekerneloptions

##e.g.howmany=all

##howmany=7

#howmany=all

##shouldupdate-grubcreatememtest86bootoption

##e.g.memtest86=true

##memtest86=false

#memtest86=true

##shouldupdate-grubadjustthevalueofthedefaultbootedsystem

##canbetrueorfalse

#updatedefaultentry=false

####EndDefaultOptions##

titleUbuntu,kernel2.6.20-16-generic

root(hd0,7)

kernel/boot/vmlinuz-2.6.20-16-genericroot=UUID=2d1136cb-416a-4329-8c6d-703537a2d578roquietsplashlocale=zh_CN

initrd/boot/initrd.img-2.6.20-16-generic

quiet

savedefault0

titleUbuntu,kernel2.6.20-16-generic(recoverymode)

root(hd0,7)

kernel/boot/vmlinuz-2.6.20-16-genericroot=UUID=2d1136cb-416a-4329-8c6d-703537a2d578rosingle

initrd/boot/initrd.img-2.6.20-16-generic1

titleUbuntu,memtest86+

root(hd0,7)

kernel/boot/memtest86+.bin

quiet2

###ENDDEBIANAUTOMAGICKERNELSLIST

#Thisisadivider,addedtoseparatethemenuitemsbelowfromtheDebian

#ones.

titleOtheroperatingsystems:

root3

#ThisentryautomaticallyaddedbytheDebianinstallerforanon-linuxOS

#on/dev/sda1

titleMicrosoftWindowsXPProfessional

root(hd0,0)

savedefault

makeactive

chainloader+14

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在上面的内容中原本的default值为0，意即启动排行第一的操作系统，这里代表的就是titleUbuntu,kernel2.6.20-16-generic。

现在对其进行修改，将其值改到与Windows相对应，Windows对应的索引号为4，那么就将default后的值改为4，以后启动的默认系统即为Windows了。

另外，启动界面的等待时间也可通过修改timeout后面的值进行修改。