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When I tried to boot ubuntu, I noticed that I should press F12 for the Boot Menu. But my keyboard's F12 and F2 is on the same key. Normally, I can press Fn+F2 for F12 after the boot process. However, I can't access the boot menu, it only takes me into the BIOS settings(which should be activated using F2). Instead of changing my keyboard, what else can I do? Thanks

user9989615
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    No, you shouldn't need to press any key to boot a correctly installed Ubuntu, single or dual-boot. And the ability to press F12 - one-time boot menu? -, with an actual F12 key or a combo must work independently and regardless of the installed OS or OSes because it's a BIOS/UEFI feature that can only be used before any OS starts to boot. –  Jun 05 '19 at 09:56
  • Try without Fn. Sometimes things are reversed pre-boot. –  Jun 05 '19 at 09:56

2 Answers2

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Access boot priority menu

The boot priority settings are often found under the Boot tab of the computer's BIOS/UEFI utility. The BIOS/UEFI utility can be accessed by pressing the key which is shown on the manufacturer's splash screen when booting. This is the F12 key on many computers. The keys to press, such as F12, F2, Del or Esc, differ on computers from different manufacturers. When grub bootloader is installed it does not change the key which is used to access the BIOS/UEFI utility.

There is a table of keys used to access the BIOS/UEFI setup utility grouped by manufacturer and computer model at this answer.

Access GRUB menu

Immediately after the motherboard / computer manufacturer logo splash screen appears when the computer is booting, with BIOS, quickly press and hold the Shift key, which will bring up a GNU GRUB menu screen. With UEFI press (perhaps several times) the Esc key to get to the GNU GRUB menu screen. Sometimes the manufacturer's splash screen is a part of the Windows bootloader, so when you power up the machine it goes straight to the GNU GRUB menu screen, and then pressing Shift is unnecessary.

karel
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Assuming that you atleast are able to log in to the Ubuntu, then Here is a step by step guide -

So You can't press the Boot menu button because your ubuntu is not detecting the keyboard at all until its completely booted up and login screen is in front of you --

All you have to do is Just login and then edit the grub settings -

  1. Open Terminal By pressing Ctrl + Alt + T

  2. Enter the Following command and press Enter, if it asks for the password Just enter your password -

sudo gedit /etc/default/grub

  1. A text editor will open in front of you and now what you have to is change two line in this file

    • If you see something like GRUB_TIMEOUT=<SOME_NUMBER> Just put a # in front of it.
    • Second is change the GRUB_TIMEOUT_STYLE=hidden to GRUB_TIMEOUT_STYLE=menu

  2. Now update the grub by hitting sudo update-grub

Now plug in your bootable device, and restart your Ubuntu, and you will presented with a GRUB menu quickly press, up arrow or down arrow button on your keyboard (You have only 3 Seconds) and once you have a menu with the No countdown going on Just press Esc on the keyboard and then you will be presented with a Terminal like screen, to exit it type exit and hit enter, and you should be now presented with the list of the all your bootable devices, select them and say goodbye to ubuntu forever.

Yanjan. Kaf.
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