[Ubuntu-9.10] 修改 grub 以更改默认启动系统

[Ubuntu-9.10] 修改 grub 以更改默认启动系统
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 网上的说法主要有两种，分别是修改两个文件：
/boot/grub/grub.conf? ?or??/boot/grub/menu.lst
### BEGIN /etc/grub.d/10_linux ###menuentry "Ubuntu, Linux 2.6.31-18-generic" {??// 0? ?? ???recordfail=1? ?? ???if [ -n ${have_grubenv} ]; then save_env recordfail; fi? ? set quiet=1? ? insmod ext2? ? set root=(hd0,8)? ? search --no-floppy --fs-uuid --set ab1eac76-a5d7-4656-8918-ffb406010912? ? linux? ?/boot/vmlinuz-2.6.31-18-generic root=UUID=ab1eac76-a5d7-4656-8918-ffb406010912 ro? ?quiet splash? ? initrd??/boot/initrd.img-2.6.31-18-generic}menuentry "Ubuntu, Linux 2.6.31-18-generic (recovery mode)" { // 1? ?? ???recordfail=1? ?? ???if [ -n ${have_grubenv} ]; then save_env recordfail; fi? ? insmod ext2? ? set root=(hd0,8)? ? search --no-floppy --fs-uuid --set ab1eac76-a5d7-4656-8918-ffb406010912? ? linux? ?/boot/vmlinuz-2.6.31-18-generic root=UUID=ab1eac76-a5d7-4656-8918-ffb406010912 ro single? ???initrd??/boot/initrd.img-2.6.31-18-generic}menuentry "Ubuntu, Linux 2.6.31-17-generic" {??// 2? ?? ???recordfail=1? ?? ???if [ -n ${have_grubenv} ]; then save_env recordfail; fi? ? set quiet=1? ? insmod ext2? ? set root=(hd0,8)? ? search --no-floppy --fs-uuid --set ab1eac76-a5d7-4656-8918-ffb406010912? ? linux? ?/boot/vmlinuz-2.6.31-17-generic root=UUID=ab1eac76-a5d7-4656-8918-ffb406010912 ro? ?quiet splash? ? initrd??/boot/initrd.img-2.6.31-17-generic}menuentry "Ubuntu, Linux 2.6.31-17-generic (recovery mode)" {??// 3? ?? ???recordfail=1? ?? ???if [ -n ${have_grubenv} ]; then save_env recordfail; fi? ? insmod ext2? ? set root=(hd0,8)? ? search --no-floppy --fs-uuid --set ab1eac76-a5d7-4656-8918-ffb406010912? ? linux? ?/boot/vmlinuz-2.6.31-17-generic root=UUID=ab1eac76-a5d7-4656-8918-ffb406010912 ro single? ???initrd??/boot/initrd.img-2.6.31-17-generic}menuentry "Ubuntu, Linux 2.6.31-14-generic" {??// 4? ?? ???recordfail=1? ?? ???if [ -n ${have_grubenv} ]; then save_env recordfail; fi? ? set quiet=1? ? insmod ext2? ? set root=(hd0,8)? ? search --no-floppy --fs-uuid --set ab1eac76-a5d7-4656-8918-ffb406010912? ? linux? ?/boot/vmlinuz-2.6.31-14-generic root=UUID=ab1eac76-a5d7-4656-8918-ffb406010912 ro? ?quiet splash splash? ? initrd??/boot/initrd.img-2.6.31-14-generic}menuentry "Ubuntu, Linux 2.6.31-14-generic (recovery mode)" {??// 5? ?? ???recordfail=1? ?? ???if [ -n ${have_grubenv} ]; then save_env recordfail; fi? ? insmod ext2? ? set root=(hd0,8)? ? search --no-floppy --fs-uuid --set ab1eac76-a5d7-4656-8918-ffb406010912? ? linux? ?/boot/vmlinuz-2.6.31-14-generic root=UUID=ab1eac76-a5d7-4656-8918-ffb406010912 ro single? ???initrd??/boot/initrd.img-2.6.31-14-generic}### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/05_debian_theme ###set menu_color_normal=white/blackset menu_color_highlight=black/white### END /etc/grub.d/05_debian_theme ###
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??fifiif [ ${recordfail} = 1 ]; then??set timeout=-1else??set timeout=10fi### END /etc/grub.d/00_header ###
> sudo chmod 244 grub.cfg> ls -l grub.cfg--w-r--r--? ? grub.cfg
> sudo vim grub.cfg
修改之后，最后别忘了：> sudo chmod 444 grub.cfg? ? // 一定记得要改回来.
我晕，用过一段时间后竟然有这么多东西，那么就用彩色来突出一下重点吧，其他内容请自动跳过。如蓝色部分所示，grub里面一共分为这么几个部分，一般三 个。再如红色部分所示，也就是 menuentry 项，所以 menuentry 项按顺序从 0 开始排列，如果想让哪个被默认启动，就将 set ห้องสมุดไป่ตู้efault=“x” 中的 x 改为那个 entry 的编号。eg，如果我的电脑想默认进 windows （虽然这是没门的事），就另 x 为 8. 体现为启动时到选择启动系统时光标默认定位在 windows 系统入口上。
#
### 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=(hd0,8)
search --no-floppy --fs-uuid --set ab1eac76-a5d7-4656-8918-ffb406010912
### BEGIN /etc/grub.d/20_memtest86+ ###menuentry "Memory test (memtest86+)" {??// 6? ? linux16 /boot/memtest86+.bin}menuentry "Memory test (memtest86+, serial console 115200)" {??// 7? ? 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)" {??// 8? ? insmod ntfs? ? set root=(hd0,1)? ? search --no-floppy --fs-uuid --set 6044685444682f4a? ? drivemap -s (hd0) ${root}? ? chainloader +1}### END /etc/grub.d/30_os-prober ###