Why is windows launching instead of grub. Bad bios settings? Wrong boot loader location?

Question

I am attempting to dual boot Linux Mint 17.2 (Cinnamon, 64 bit) and Windows 8.1 on my Acer E 15 (model # E5-573-55W1).

I have successfully installed Mint, but I can't get grub to start in a reasonable way. Here is what I have done:

1. From Windows, create a new partition on my machine to install Mint onto
2. Created a bootable USB drive
3. Restarted my computer and pressed F2 to enter the bios settings:
   1. Bootmode: UEFI
   2. Secure Boot: Disabled
   3. Boot Order: USB HDD First
4. Mint boots from the USB drive and I install:
   1. The installer didn't recognize that I had windows installed, so I selected the something else option (IE not the remove everything option).
   2. I created 3 new partition from the new partition that I made in windows, one for /, one for swap and one for /home.

Now I am confused, as to what my bios settings should be. I have the following set:

• Bootmode: UEFI
• Secure Boot: Disabled
• Boot order: (see image)

When I boot, I don't get grub. I go directly to windows.

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I know that my install worked because I was able to launch it through the grub on the USB. I can provide more detailed instructions on this if that would be helpful.

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Full computer information:

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The things that I am suspicious of right now are:

• Bad bios settings
• Wrong boot loader location

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Edit

Reinstall with different boot loader location

I re-installed and set the Device for boot loader installation to sda2 but that didn't make any difference. Same behavior.

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Edit

Steps to Boot into Linux Mint (in a unacceptably poor way):

• In bios set the boot order to use the USB HDD

• Grub will be launched. Press ESC:

• Now you should be in Grub command mode. Exit it by typing exit:

• Now you should be on the Boot Manager page. From here you can launch the right grub (IE the first option):

• This is what the right grub looks like. The first option will launch the installed version of linux mint (complete with the username I created during install). The third option will start windows.

The only question remaining, is why can't I open this grub on startup? What bios settings do I need?

Answer 1

The answer was posted over at askUbuntu and it worked for me. Thanks @gio900. I have copy & pasted the answer below (to avoid broken links):

So I resolved in the simplest way:

• let boot mode UEFI enable, secure boot enable
• in bios added the USB boot file of the distribution I want to install as trusted for executing:
  • My bios is: Phoenix SecureCore Tiano Setup
  • under Boot I flag Boot Mode UEFI
  • Secure Boot ENABLE
  • under SECURITY i select: "Select an UEFI file as trusted for executing"
  • in "Available File System" i select fs0:$nameofmyusbkey
  • select [EFI]
  • select [BOOT]
  • select BOOTx64.EFI
  • give it the name "whateveryouwant" then, using tab, select YES.
  • so I go to the Boot option, then put "whateveryouwant" as first in the Boot priority order
  • then I was able to start Ubuntu installation in UEFI mode! :)

WARNIG!

before I did all them, I free the space for my partitions under win8, I read so many guide about UEFI and UEFI install (I give advice to do it!), and try in several way. That was the only way I was able to do what I want

Note: In order to add items to the boot priority order you must be have Secure Boot set to Enabled....