Here is my code from grub config:

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=”Ubuntu”
GRUB_TIMEOUT_STYLE=”menu”
GRUB_TIMEOUT=”10″
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=”640×480″

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_SAVEDEFAULT=”false”
#GRUB_HIDDEN_TIMEOUT=”4″

What needs to be done?

I cannot find decision for this