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I used Yumi to setup a multiboot USB. When I go to my boot menu however, it doesn't show an entry for my USB stick. I know it's not an issue with the USB because when I had only Ubuntu Live USB, everything was fine. Also I have it setup with ESP and boot flags so it should be UEFI enabled.

Why could this be happening?

FYI my PC is an Acer Aspire E15.

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Kashif
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  • You need to provide, at a minimum, your computer make and model. I've attempted to provide an answer, but it could be way off. – can-ned_food Mar 17 '17 at 02:41
  • It looks like this could be helpful: http://community.acer.com/t5/Legacy-Laptops-and-Netbooks/Can-t-boot-from-USB-stick-Acer-Aspire-E15/td-p/282592 – can-ned_food Mar 17 '17 at 03:04
  • I only see Ubuntu and Windows boot manager options showing up in my boot menu though. – Kashif Mar 17 '17 at 06:45

2 Answers2

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By “boot menu”, I take it that you don't mean the BIOS device selection menu. Depending on the model of computer, you probably need to press a key to activate that menu.
E.g. on my HP Pavilion dv7, I must press the Esc key to select a boot device, else it proceeds to boot with the first available device as per my precedential list.

On some older computers, e.g. my Dell Inspiron 5100, there was no such menu. One needed to configure the precedences of boot devices from the BIOS setup interface if one wanted to boot from a different device.

In short, you probably aren't seeing the boot menu on your YUMI stick because you are continuing to boot from the first available device as per your BIOS device list.

can-ned_food
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  • When I go to the BIOS device selection menu, it only shows Windows and Ubuntu (corresponding to the two hard drives I have). It doesn't display my USB, and it should (it at least shows up when I run GParted). That's the issue. – Kashif Mar 17 '17 at 03:00
  • @Glassjawed That doesn't seem to me like a boot device menu, but a boot manager menu. See to my more recent comment for your question proper. – can-ned_food Mar 17 '17 at 03:06
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Did you use the regular YUMI, or the UEFI YUMI BETA version? It definitely sounds like the computer's UEFI isn't letting the USB boot, maybe it's not a UEFI YUMI drive.

According to YUMI's webpage under UEFI YUMI BETA (and being beta it's probably not 100% bug-free):

Important UEFI YUMI info: You'll need to disable secure boot (if it's enabled). Also note that 32bit UEFI firmware does not work yet.

Xen2050
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  • I disabled secure boot and the USB option still didn't show up. – Kashif Mar 17 '17 at 06:43
  • Is the USB really bootable? Will it boot & work on any other computers? Maybe it's just missing a bootable flag, or maybe it wasn't created successfully. – Xen2050 Mar 17 '17 at 06:57
  • I fixed it. I had to use YUMI Beta instead of YUMI for this to create a UEFI USB. – Kashif Mar 17 '17 at 15:36
  • @Glassjawed BTW, did you forget to accept this answer? :-) You know the drill. – can-ned_food Mar 17 '17 at 17:58
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    @can-ned_food Thanks, maybe I'll get an upvote sometime too. Your answer could've been right, I'll give it an up-arrow too. Was either that or this one (or could've been #3 that computer just hates that usb & will never work) – Xen2050 Mar 18 '17 at 08:07