i'm trying to install Elementary OS 6, and the Live USB refuses to boot. Everything is normal, i downloaded the image and flashed it with Balena Etcher, and then, after trying to boot it, it gives this error : 
This is kinda unusual since Eos 5.1 booted normally without problems ( Oh, and also, Here are my specs : ) CPU: Intel i3-6006U (4) @ 2.000GHz GPU: Intel HD Graphics 520 Memory: 4GB Host: Inspiron 15-3567
I had the same error while being in legacy mode. My fix was to change the BIOS to read a different file than its default in the folder /efi/boot on the usb-stick. To do that I had to create a new boot option as depicted on the photo.
My laptop a is a Dell Inspiron 3583.
I was able to fix this by inserting the USB drive (with the elementary iso) into another Linux machine running on it and typing the following :
efibootmgr --create --label Elementary --disk /dev/sda1 --loader "\EFI\boot\grubx64.efi"
This is assuming the USB is showing up as sda1.
I am experiencing the same problem on a Dell Optiplex 2090 desktop. I think the provided disk image doesn't have proper support for UEFI and/or secure boot.
To make it boot, I pressed F2 while the system was starting to enter BIOS settings. From there I enabled "Legacy boot" instead of UEFI.
After that, I am able to boot into the installer. Please be aware that if you're dual-booting, changing this setting could prevent you from booting another OS.
This is a known problem and is being tracked here: https://github.com/elementary/triage/issues/74
There's a workaround:
Downloading an Ubuntu 20.04.2 iso and copying the EFI folder from it to the elementary media (overwriting the original EFI files) seems to work as a workaround.
I have a Dell Inspiron 15 3583 and I am also affected by this.
