我需要进入恢复模式，但在启动过程中按住 shift 不起作用，我也尝试点击 shift 和 f8，但没有任何反应，有什么建议吗？我的系统运行 ubuntu 14.04，这是我的 grub 文件：
# 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_HIDDEN_TIMEOUT=5
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
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"
答案1
如果按键不起作用，您实际上可以编辑文件，grub config以便有一点超时时间。
sudo gedit /etc/default/grub
改变值GRUB_HIDDEN_TIMEOUT改为以秒为单位的数字。例如，如果您将其从 0 更改为 10，它将显示 Grub 菜单 10 秒，然后自动启动第一个选项。
完成所需的更改并保存文件后，关闭它并运行以下命令来应用更改：
sudo update-grub
在那之后
sudo reboot