如图为我的虚拟机启动时的截图：
/boot/grub/grub.conf配置文件：
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot
Ubuntu system is short of a simple graphical grub2 management program.but we find GrubCustomizer.Also GrubCustomizer provide a simple function,it is enough up to now.The article intrduce its usage and
