grub 설정 관련해서 /etc/default/grub 이거 외 다른 설정 파일도 있을까요???

지금까지 계속 /etc/default/grub 이걸 수정했는데, 느낌이 이 설정이 먹지 않는거 같은 느낌이 들어서

다른 파일이 있나 질문 드립니다....ChatGpt 가 알려준대로도 해보고, grub-customizer도 삭제도 해보고 했는데, 

여전히 os선택하는 화면이 나오고 있습니다...왜 이러나 모르겠네요...;;;

아래는 사용하고 있는 grub 내용 입니다.

 

# 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="0"

GRUB_DISTRIBUTOR="`( . /etc/os-release; echo ${NAME:-Ubuntu} ) 2>/dev/null || echo Ubuntu`"

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

GRUB_CMDLINE_LINUX=""

 

# If your computer has multiple operating systems installed, then you

# probably want to run os-prober. However, if your computer is a host

# for guest OSes installed via LVM or raw disk devices, running

# os-prober can cause damage to those guest OSes as it mounts

# filesystems to look for things.

GRUB_DISABLE_OS_PROBER="true"

 

# 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_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="auto"

 

# 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_HIDDEN_TIMEOUT="0"

GRUB_SAVEDEFAULT="false"