grub2坏了,liveCD修复后可以进入ubuntu，不出现grub2引导菜单

[Palocc]

我的grub2不能引导了，按照论坛上的修复步骤，修复了grub2，可以进入ubuntu

在ubuntu下执行

update-grub2后，终端显示：

Generating grub.cfg ...
Found linux image: /boot/vmlinuz-2.6.31-14-generic
Found initrd image: /boot/initrd.img-2.6.31-14-generic
Found memtest86+ image: /boot/memtest86+.bin
Found Windows 7 (loader) on /dev/sda2
done


查看/boot/grub/grub/cfg,内容如下

代码： 全选

#
# 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 /boot/grub/grubenv ]; then
  have_grubenv=true
  load_env
fi
set default="0"
if [ ${prev_saved_entry} ]; then
  saved_entry=${prev_saved_entry}
  save_env saved_entry
  prev_saved_entry=
  save_env prev_saved_entry
fi
insmod ext2
set root=(hd0,3)
search --no-floppy --fs-uuid --set d778bb1b-d868-4316-960c-b5690fe517e6
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
if [ ${recordfail} = 1 ]; then
  set timeout=-1
else
  set timeout=0
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/white
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry "Ubuntu, Linux 2.6.31-14-generic" {
        recordfail=1
        if [ -n ${have_grubenv} ]; then save_env recordfail; fi
	set quiet=1
	insmod ext2
	set root=(hd0,3)
	search --no-floppy --fs-uuid --set d778bb1b-d868-4316-960c-b5690fe517e6
	linux	/boot/vmlinuz-2.6.31-14-generic root=UUID=d778bb1b-d868-4316-960c-b5690fe517e6 ro   quiet splash
	initrd	/boot/initrd.img-2.6.31-14-generic
}
menuentry "Ubuntu, Linux 2.6.31-14-generic (recovery mode)" {
        recordfail=1
        if [ -n ${have_grubenv} ]; then save_env recordfail; fi
	insmod ext2
	set root=(hd0,3)
	search --no-floppy --fs-uuid --set d778bb1b-d868-4316-960c-b5690fe517e6
	linux	/boot/vmlinuz-2.6.31-14-generic root=UUID=d778bb1b-d868-4316-960c-b5690fe517e6 ro single 
	initrd	/boot/initrd.img-2.6.31-14-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
	linux16	/boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
	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/sda2)" {
	insmod ntfs
	set root=(hd0,2)
	search --no-floppy --fs-uuid --set 5990ff062b1b71a4
	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 ###

上面明明有 “Windows 7 (loader) (on /dev/sda2)"的字样，为什么重启系统grub2菜单不出来，而是和单系统一样，直接进入ubuntu

[速腾1994]

哈哈，时间问题
开机按shit键试试

[速腾1994]

不知你的键盘有shit键没，不行就按shift也可以的哦

[Palocc]

我去试试看。

楼上二位的一意思是，启动时间是0，所以不等界面出来，就已经进入系统了。

那我只要修改一下/etc/default/grub里面的启动时，然后重新update-grub2应该就ok了

现在就是试试看，先谢谢啦哈～

[Palocc]

哈哈，实验过了，果然如此。

原来我之前想用think boot这种图形引导程序，比较好玩。
但是从图形界面选择某个系统，比如ubuntu，还是会进入gurb的界面，还要再选一次，所以我干脆把ubuntu的timeout设置0了，同时win7也设置了0


结果这次如果不是两位提醒，我也没想起来是这的问题

多谢多谢～哈哈