I have to press enter in the grub menu! earlier the 10 second timer was there. but now, I have to press enter (no timer is there). How to repair it?

My grub file:

# 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="5"

GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo BOSS`"

GRUB_CMDLINE_LINUX_DEFAULT="splash gfxpayload=1024x768x16 quiet"

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"