How to Hide Grub Boot Menu in Ubuntu 20.04 LTS

This tutorial shows how to hide / disable the Grub boot menu while booting up.

You can do the job easily via Grub-Customizer (available in Ubuntu Software) under General Settings tab.However, you need to also disable “look for other operating systems” option.

Any time you want to show the Grub menu, press ESC while booting up will NO longer show dual-boot (multi-boot) systems other than Ubuntu.

How to Hide Grub Boot Menu in Ubuntu 20.04 LTS

NOT OK with Grub-Customizer settings? Re-enable “show menu” and “look for other operating systems” options, save changes, and do following steps one by one.

1.) Show or hide the boot menu relies on the values ​​of ‘GRUB_TIMEOUT_STYLE’ and ‘GRUB_TIMEOUT’. However, the two values ​​in /etc/default/grub does not work!

It’s because /etc/grub.d/30_os-prober overrides them by setting timeout to 10 (if it’s 0 in /etc/default/grub) and always to display menu.

Open terminal (Ctrl+Alt+T) and run command to edit the configuration file:

sudo -H gedit /etc/grub.d/30_os-prober

Type user password (no asterisk feedback) for sudo prompt.
When the file opens, disable the last line by adding # in the beginning.So it will be:

#adjust_timeout

How to Hide Grub Boot Menu in Ubuntu 20.04 LTS

2.) Now edit the /etc/default/grub file via command:

sudo -H gedit /etc/default/grub

When the file opens, change the values:

  • set GRUB_TIMEOUT_STYLE to “hidden” or “countdown”
  • set GRUB_TIMEOUT to “0”

Actually, set GRUB_TIMEOUT to “1” will boot faster! Tested in “countdown” mode, while value “0” still counts 3,2,1,0, value “1” will count 1,0.

How to Hide Grub Boot Menu in Ubuntu 20.04 LTS

3.) Finally apply changes via command:

sudo update-grub

How to restore:

To restore the changes, simply run command in step 1), then re-enable the last line by removing # so it will be:

adjust_timeout

And apply change by running command sudo update-grub.

It’s a sequel.

It’s a sequel.
It’s a sequel.

Sidebar