我想在 Ubuntu 23.04 中隐藏 GRUB2 启动菜单，但它可以根据我的需要从启动过程中打开。我尝试添加GRUB_TIMEOUT = -1，但它无法隐藏并且仍然显示。我的/etc/default/grub文件如下：
# 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=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=-1
GRUB_RECORDFAIL_TIMEOUT=$GRUB_TIMEOUT
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"
如果我设置了它GRUB_TIMEOUT = 0，我无法打开 GRUB2 菜单，但它也会被隐藏。我尝试按住 Shift 或 Esc 按钮，但它无法打开 GRUB2 菜单。我想让我的 Ubuntu 像 Fedora 一样，它可以隐藏 GRUB2 启动菜单，但它可以通过按住 Shift 按钮来访问。我该怎么办？谢谢你的帮助