This question already has an answer here:

I have a dual boot system. I mainly work with Linux and rarely with Windows, so I want to set Linux to boot by default without bringing up the GRUB menu, but to bring up the menu if I press SHIFT so I can boot into Windows.

I already hide the grub menu and boot by default with Linux and only shows the GRUB menu when I press SHIFT, but this only works if I disable the Look for other OS option, and as a result of that Windows doesn't appear as an option in the menu, so I can't boot into it!

How can I get the configuration I want?

marked as duplicate by mikewhatever, David Foerster, Zanna, pomsky, waltinator Mar 6 '18 at 5:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • @DavidFoerster since that question describes a different situation, could you indicate which of its answers OP should implement? – Zanna Mar 5 '18 at 8:11
  • 1
    @Zanna: Good idea! I mean tomodachi's answer specifically. – David Foerster Mar 5 '18 at 12:37
  • I am currently using this configuration but I rather getting the menu only if I press, this is bring me the menu every time. But of course this is the better solution so far. – Ricardo Villagrana Larios Mar 6 '18 at 15:50

You need to edit as root the file /etc/default/grub and modify a few lines at the top to the hidden timeout. In my case it looks as follows:

#GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 3.13.0-101-generic"
  • The menu should come up every time with that configuration... you seem to have an extra customised GRUB_DEFAULT line, but since it's commented out (starts with #), it won't do anything at all. So, what are you talking about? – Zanna Mar 4 '18 at 8:04
  • GRUB_TIMEOUT=10 will give you 10s to select an OS (windows in his case) otherwise it will boot into Linux. – Harris Mar 4 '18 at 23:32
  • Yeah, but that's the default configuration in dual boot. OP doesn't want to see the GRUB menu unless they press shift – Zanna Mar 5 '18 at 8:09

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