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NeStack
Asked: 2020-03-11 10:16:30 +0800 CST

Ubuntu is a boot option, but it's not in the boot order setup

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I've had a Windows 10 and Ubuntu 18.04 dual boot for a year. Both OSs work fine. My computer loads Windows by default on start-up, but I'd prefer on start-up to select either OS from the GRUB boot menu option or start Ubuntu at least. I went into the boot menu where Ubuntu is listed and then into the boot order setup, but in the boot order Ubuntu was not listed (see images).

Did I install Ubuntu wrong or is it because I have both Windows and Ubuntu on SSDPEKKW512GB (see images). I don't understand sysadmin and hardware stuff.

Is there a workaround that lets me have on start-up the boot screen or that loads straight into Ubuntu?

Sometimes I need multiple restarts followed by pressing Fn+F7 to get into the boot screen. Somehow they get ignored and Windows starts straightaway. Is this connected to the previous issues?

This thread doesn't solve my issue, I have already tried GRUB_DEFAULT=0 and Ubuntu in the /etc/default/grub file without success.

Just in case I attached my grub screen too.

Please select boot device

BIOS boot options

GRUB

grub2 boot dual-boot partitioning

3 Answers

  1. Running this in Windows points the PC to boot into GRUB instead:

    bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi
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  2. On startup, enter Ubuntu. When Ubuntu starts up, enter either the terminal. Enter the following commands:

    gksudo gedit /etc/default/grub

    When that command opens, chnage GRUB_DEFAULT=0 to GRUB_DEFAULT=saved and then enter. Update GRUB with the command

    sudo update-grub

    Finally, set default OS with sudo grub-set-default NUMBER. NUMBER is the number of the OS that you want to set to default.

    OR

    install GRUB-customizer with the following commands:

    sudo add-apt-repository ppa:danielrichter2007/grub-customizer

sudo apt-get update

sudo apt-get install grub-customizer

    Cited from: https://tipsonubuntu.com/2016/07/20/grub2-boot-order-ubuntu-16-04/

    This may provide more detailed information on what you are looking for. I hope this helps.

    • 1
  3. Best Answer

    I found the problem and a workaround. The comment by @karel is insightful, but I don't have the knowledge to try it out. Instead, I found another way to choose the OS on start-up.

    The problem: In the UEFI [Boot-Options] tab, as you see in the screenshot in the question, the setup prompt timeout was by default 1 sec.

    The fix: I set it to a slightly larger value, 3 sec! I guess the 1 sec was too short so that on start it wouldn't get me every time into the UEFI boot screen by pressing Fn+F7. Now, on every start without pressing Fn+F7, I get straight into the GRUB menu, where I have set Ubuntu as the default booting OS (here how to set the default OS)

    To be fair, I tried a few other things on the way to solving this problem, that might have also contributed to solving it, like the advice above by @K7AAY

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