Grub (linux bootloader) - Change boot delay timeout

Many Linux distributions use Grub as a bootloader. As default, there is a 10 second delay at boot. Here's how to change it:

We just need to edit one file to modify this delay:

(Instead of mousepad, feel free to use your favourite text editor - gedit for example)

Enter your root password and press return. Find the line:

Change it to:

Save and close the text editor.

Lastly, run:

Enter your root password again if prompted.