Why in Ubuntu 17.10 do not work options in Grub 2?

Want to remove OS selection menu and allow it to boot first Ubuntu. The default is timer for 10 seconds.

Configuration of /etc/default/grub:
# 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_DISTRIBUTOR=`lsb_release -i-s 2> /dev/null || echo Debian`

# 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 ...)

# Uncomment to disable graphical terminal (grub-pc only)

# 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'

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

# Uncomment to disable generation of recovery mode menu entries

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

$ sudo update-grub
Generated grub configuration file ...
Found linux image: /boot/vmlinuz-4.13.0-32-generic
Found initrd image: /boot/initrd.img-4.13.0-32-generic
Found linux image: /boot/vmlinuz-4.13.0-31-generic
Found initrd image: /boot/initrd.img-4.13.0-31-generic
Found linux image: /boot/vmlinuz-4.13.0-25-generic
Found initrd image: /boot/initrd.img-4.13.0-25-generic
Found linux image: /boot/vmlinuz-4.13.0-21-generic
Found initrd image: /boot/initrd.img-4.13.0-21-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
10 found Windows on /dev/sda1

No matter what I change, nothing changes. sudo update-grub did. What is the reason?
June 8th 19 at 17:16
1 answer
June 8th 19 at 17:18
As far as I remember at the same time
it is impossible to write.
Put GRUB_HIDDEN_TIMEOUT=1 and menu is visible only for a second. I will dig further. - meggie commented on June 8th 19 at 17:21

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