????/boot/grub/grub.cfg?????????????????????????????????????
????????????????????Ubuntu???update-grub????￡????????????Ч??
????1.??????
root@ubuntu:~# gedit /etc/default/grub
#??? GRUB_DEFAULT=0 ????????б???????????????????0???????????????? windows ???? 4#
????2.???
????root@ubuntu:~# update-grub
???????????????
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.2.0-29-generic-pae
Found initrd image: /boot/initrd.img-3.2.0-29-generic-pae
Found memtest86+ image: /memtest86+.bin
Found Microsoft Windows XP Professional on /dev/sda1
done
????3.????
??????????????????????????????д???????????????????