Boot Troubles

[Glyndwr714]

So, I'm having troubles booting the minimal installation .iso file, but I suspect something is also acting up on my hard drive's MBR... not exactly sure.

What I want to do is boot the minimal install .iso from my usb, and install it onto my laptop in native UEFI mode.
I've tried using both GPT and MBR settings on Rufus, UEFI exclusive, but states the ISO doesn't support EFI as below.
https://gyazo.com/c8c1c4543b2a6fccb55d74b3465204e2
Using MBR for BIOS/UEFI on my USB works, but it still doesn't boot.

For some reason, I can't use the System Rescue CD to install because its net-setup script either doesn't support WPA or doesn't like my hardware.

UEFI boot from USB is enabled in my BIOS settings.

Pics of my BIOS screen:
https://gyazo.com/0523821f1f54067737322db9a06bed46
https://gyazo.com/778dd24b8c163da4de254d497d514b1e

Ubuntu is a UEFI Mint installation... void-grub persists from when I had Void Linux installed. Selecting it as a boot option does nothing, this has been the case ever since I deleted its partitions.
https://gyazo.com/5379b51ca01eec114d43b334b95afc93

So, I'm unsure of what to do. I've (tried) to install Gentoo before, on legacy mode, (which went totally smooth until reboot! ) but it didn't work because I suspect something is wrong with my MBR... or earlier grub installations...

Any help much appreciated! Will provide screenshots and any other information upon request.

[eccerr0r]

I believe the min installer ISO still is MBR only.
You'll need to use something that can boot in EFI mode, like the SysRescueCD which has EFI support.
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Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching?

[Jaglover]

You can install when booted in MBR mode and set up UEFI mode later, so you can use minimal, you just need to boot later in UEFI mode from some other media and set efivars.
And you do not need net-setup script to set up network, so it will not stop you from using SysRescue. I believe there is even a page for manual network setup in Handbook.
See, everything is simple and open in Gentoo.
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My Gentoo installation notes.
Please learn how to denote units correctly!

[Glyndwr714]

[Glyndwr714]

[eccerr0r]

Correct. If you boot in MBR mode, the thing you can't do is get EFI BIOS to set up the boot parameters like the menu, etc., as these are stored in the EFI variables which are not enabled when CSM is used to boot. Otherwise the system is mostly the same.

Technically if you know exactly what the boot image location is, you can install to that location and it should work. However this tends to be system specific and if it has been changed, it would be hard to guess...
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Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching?

[Glyndwr714]

[eccerr0r]

Yes, the menus are edited by changing the efivars or efi variables.

You merely need to find a Linux that boots via EFI - like the sysrescuecd - and then change your menu/finalize your bootloader with that.
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching?

[Ant P.]

There is a way to get to EFI mode without starting from bootable EFI media - make a kernel with the efi stub loader enabled, and name it ./efi/boot/bootx64.efi in the EFI system partition. That should be hardcoded in most firmware variants and allow you to pick it from the boot menu without changing any settings.

[Glyndwr714]

Okay, thank you all for the useful information! My friends were right when they said the Gentoo community was so inclusive.

However, I'm a bit hesitant to be experimenting with EFI like this, and I've never done it before, so I think I'll stick to my MBR comfort zone.