that's MBR mode. If you boot Linux in UEFI mode, it will write the correct bits of info. I have generally not seen a non-UEFI bios or computer in the past 6-7

that's MBR mode. If you boot Linux in UEFI mode, it will write the correct bits of info. I have generally not seen a non-UEFI bios or computer in the past 6-7 years. So you should be fine with UEFI. Again, for some reason Linux installers scare you into using MBR mode. Its unnecessary now.