Most system past like 2010 run UEFI, so go ahead and do UEFI install.
But if the system boots into _ symbol blinking with no
output, or you where smart and checked /sys/firmware/efi
directory - tough luck, you got legacy boot on your hands.
Straight forward - you need a vfat partition, around 512
- 1000 MB to store your boot data. You can also look into
/sys/firmware/efi/fw_platform_size, which will return 64
for x64 UEFI or 32 for 32-bit IA32 UEFI. Later is only supported by
systemd-boot, or so I've heard.
Either use MBR (ass), or on GPT create a BIOS boot partition
- 1-2 MB partition used to store some legacy BIOS boot code. MBR had
this baked in, but on GPT you need to create it explicitly. FS for this
partition probably should be vfat. Some distributions work
with GPT, on some it's easier to just do MBR. Don't forget to install
grub dumbass,
boot.loader.grub.device = "/dev/disk/by-id/ata-xxx" on
NixOS.