Notice： 修改完 /etc/default/grub ，需要执行 sudo update-grub 生成 /boot/grub/grub.cfg，重启后生效

加五角星标注为平常修改的选项，其他除特殊用途基本不需要修改，//后面的为注释:

#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

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

#GRUB_TERMINAL=console        //设置是否使用图形介面。去除前面#，仅使用控制台终端，不使用图形介面

# 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       // ★ 设定图形介面分辨率，如不使用默认，把前面#去掉，分辨率按需修改

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

#GRUB_DISABLE_LINUX_UUID=true       //设置grub命令是否使用UUID，去掉#，使用root=/dev/sdax而不用root=UUDI=xxx

# Uncomment to disable generation of recovery mode menu entries

#GRUB_DISABLE_RECOVERY="true"        //设定是否创建修复模式菜单项

# Uncomment to get a beep at grub start

#GRUB_INIT_TUNE="480 440 1"