GRUBの変更は適用されませんでした。

GRUBの変更は適用されませんでした。

Linux Mint 19 CinnamonでGRUBメニューを非表示にします。

管理者パスワードでgrubファイルを編集して2回入力しました

gedit admin:///etc/default/grub

その後、grubファイルを次のように編集しました。

# 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_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_DEFAULT=0
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"

変更後にGRUBを更新しました。

sudo update-grub

PCを再起動しても、30秒タイマーのあるGRUBメニューが表示され続けます。一部のエントリが欠落しているか、編集が必要な他のファイルがありますか?

ベストアンサー1

設定GRUB_RECORDFAIL_TIMEOUT=0してから実行する必要があります。/etc/default/grubupdate-grub

info -f grub -n 'Simple configuration' | less  -p 'GRUB_RECORDFAIL_TIMEOUT'
'GRUB_RECORDFAIL_TIMEOUT'

If this option is set, it overrides the default recordfail setting.
 A setting of -1 causes GRUB to wait for user input indefinitely.
 However, a false positive in the recordfail mechanism may occur if
 power is lost during boot before boot success is recorded in
 userspace.  The default setting is 30, which causes GRUB to wait
 for user input for thirty seconds before continuing.  This default
 allows interactive users the opportunity to switch to a different,
 working kernel, while avoiding a false positive causing the boot to
 block indefinitely on headless and appliance systems where access
 to a console is restricted or limited.

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