/boot/grub里有个ＧＲＵＢ.ＣＧＦ怎么改，修改后不能保存，闷呀

为什么要改这个文件？
文件说明写的清清楚楚。

默认时间是10秒，我要修改为1秒呀。说明。。。。。。看不懂
#
# 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 video_bochs
insmod video_cirrus
}

insmod part_msdos
insmod ntfs
set root='(hd1,msdos7)'
search --no-floppy --fs-uuid --set=root B840ACAB40AC71B4
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=auto
load_video
insmod gfxterm
insmod part_msdos
insmod ntfs
set root='(hd1,msdos7)'
search --no-floppy --fs-uuid --set=root B840ACAB40AC71B4
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
set locale_dir=($root)/boot/grub/locale
set lang=zh_CN
insmod gettext
fi
terminal_output gfxterm
if [ "${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
if background_color 44,0,30; then
clear
fi
### 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 ###
if [ ${recordfail} != 1 ]; then
if [ -e ${prefix}/gfxblacklist.txt ]; then
if hwmatch ${prefix}/gfxblacklist.txt 3; then
if [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Ubuntu，Linux 3.2.0-21-generic' --class ubuntu --class gnu-linux --class gnu --class os {
set gfxpayload=$linux_gfx_mode
insmod part_msdos
insmod ntfs
set root='(hd1,msdos7)'
search --no-floppy --fs-uuid --set=root B840ACAB40AC71B4
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-3.2.0-21-generic root=UUID=B840ACAB40AC71B4 loop=/ubuntu/disks/root.disk ro quiet splash vt.handoff=7
initrd /boot/initrd.img-3.2.0-21-generic
}
menuentry 'Ubuntu，Linux 3.2.0-21-generic (恢复模式)' --class ubuntu --class gnu-linux --class gnu --class os {
insmod part_msdos
insmod ntfs
set root='(hd1,msdos7)'
search --no-floppy --fs-uuid --set=root B840ACAB40AC71B4
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
echo '载入 Linux 3.2.0-21-generic ...'
linux /boot/vmlinuz-3.2.0-21-generic root=UUID=B840ACAB40AC71B4 loop=/ubuntu/disks/root.disk ro recovery nomodeset
echo '载入初始化内存盘...'
initrd /boot/initrd.img-3.2.0-21-generic
}
submenu "Previous Linux versions" {
menuentry 'Ubuntu，Linux 3.2.0-20-generic' --class ubuntu --class gnu-linux --class gnu --class os {
set gfxpayload=$linux_gfx_mode
insmod part_msdos
insmod ntfs
set root='(hd1,msdos7)'
search --no-floppy --fs-uuid --set=root B840ACAB40AC71B4
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-3.2.0-20-generic root=UUID=B840ACAB40AC71B4 loop=/ubuntu/disks/root.disk ro quiet splash vt.handoff=7
initrd /boot/initrd.img-3.2.0-20-generic
}
menuentry 'Ubuntu，Linux 3.2.0-20-generic (恢复模式)' --class ubuntu --class gnu-linux --class gnu --class os {
insmod part_msdos
insmod ntfs
set root='(hd1,msdos7)'
search --no-floppy --fs-uuid --set=root B840ACAB40AC71B4
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
echo '载入 Linux 3.2.0-20-generic ...'
linux /boot/vmlinuz-3.2.0-20-generic root=UUID=B840ACAB40AC71B4 loop=/ubuntu/disks/root.disk ro recovery nomodeset
echo '载入初始化内存盘...'
initrd /boot/initrd.img-3.2.0-20-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 "Ubuntu (on /dev/sda1)" --class windows --class os {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set=root 3608534B0853096F
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 ###

修改这个文件。
其中的把10改成1就行了
然后

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

请问这些代码要在哪里写。终端吗。进入终端后执行什么命令，我是菜鸟，

[email protected]:/etc/default# sudo update-grub 2
Searching for GRUB installation directory ... found: /boot/grub
Cannot determine root device. Assuming /dev/hda1
This error is probably caused by an invalid /etc/fstab
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-3.2.0-23-generic
Found kernel: /boot/vmlinuz-3.2.0-22-generic
Found kernel: /boot/vmlinuz-3.2.0-21-generic
Found kernel: /boot/vmlinuz-3.2.0-20-generic
Found kernel: /boot/memtest86+.bin
Updating /boot/grub/menu.lst ... done



还是不行，GRUB_TIMEOUT＝10还是10秒