无法在Ubuntu 18.04上跳过Grub v.2.02启动菜单

我在Lenovo Flex 5 15-ElementaryOS 5上安装了一个操作系统(只是基于Ubuntu 18.04的许多发行版之一)。 当我打开笔记本电脑时,会出现Grub v。2.02启动菜单,并且我有30秒的时间来选择(例如,开始加载Elementary或Setup)。

我想跳过此启动菜单,默认情况下启动Elementary。 我试图编辑/ etc / default / grub,但是它并没有改变任何东西。这是我的/ etc / default / grub内容:

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT="elementary"
GRUB_HIDDEN_TIMEOUT="0"
GRUB_HIDDEN_TIMEOUT_QUIET="true"
#GRUB_TIMEOUT_STYLE="hidden"
GRUB_TIMEOUT="5"
GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL="console"

# 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"

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

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

GRUB_DISABLE_OS_PROBER="true"

另外,我已经尝试通过Grub Customizer更改grub的配置。不幸的是,它也没有取得任何结果。这是我更改的选项的屏幕截图:

Grub Customizer Screenshot

希望您能帮助我找到解决方案。 先感谢您。