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- It's time for a change.

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I'm going to show you Ubuntu.

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So we need sudo vim /etc/default/grub.

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And then we can see the Ubuntu version

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of the /etc/default/grub.

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What I like about it is
that it's also telling us

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where to find the documentation.

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You know, documentation in
many, many cases is in man.

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But for the grub documentation,
you really need info.

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And if you use info -f grub
-n 'Simple configuration'

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you get to a location

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where you can find all the
documentation that you need.

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Let me show you.

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So, here you can see

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all the different options
that are available.

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Now what do we need?

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Grub default and grub
timeout style is hidden.

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Well, grub timeout style,

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we need to know more
about grub timeout style.

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So, what is this?

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Well, I'm using Slash to search
for the regular expression

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which is what you see
in the lower left corner

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and grub timeout style.

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And there we can see the different options

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that are available.

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If this option is unset or
set to menu, set to menu.

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That's what we need.

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Then grub will display the menu.

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So that's one thing.

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Set it to menu instead
of timeout style hidden.

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And grub timeout, we
set that to 10 seconds.

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And also, I want to have a look
at the grub disable submenu,

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which is kind of confusing.

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So, GRUB_

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DISABLE_

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SUBMENU is showing us what?

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Well, that is showing

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what it wants to do

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with this grub submenu.

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Well, this grub submenu has nothing to do

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with the options that we've got,

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and I don't need that at all.

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So grub timeout cell, that
is what we are going to need.

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Now, also here in this
Ubuntu configuration,

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you can see it's telling
us to use update-grub.

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Ubuntu is using update
grub, not GRUB 2 mkconfig

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because update grub is easier to use,

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and that's all it is.

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So, let's do sudo

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update-grub

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to write the configuration.

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There we go.

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And next, let's use sudo reboot

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to figure out what the result is.

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And there we go.

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Here is the grub boot menu

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in which I can select the
option that I want to use

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or do nothing.

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Look at the lower line
where we can see the counter

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which is counting down.

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And now it's starting
the default menu entry.

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And that's the end of lesson seven lab.