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I created a Ubuntu Gnome 16.04.03 (64 bits) bootable usb using Startup Disk Creator and I am wondering whether there is a way (maybe with Gparted) to check if it is a BIOS or UEFI boot.

Checking the USB with Disks (Ubuntu 16.04), this is what I see:

First Partition of USB

Second Partition of USB

As you can see, in the Second Partition it says: Partition Type EFI(FAT-12/16/32). Does this mean this is NOT BIOS?

Cheers

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  • It should work in both modes. – user692175 Aug 19 '17 at 16:29
  • Unless you modified the Ubuntu iso, it is able to boot both in UEFI or Legacy BIOS mode. – Byte Commander Aug 19 '17 at 16:32
  • But how do I ensure that it will install UEFI – Francisco Aug 19 '17 at 16:33
  • That depends on whether you boot it in UEFI or in Legacy BIOS mode. There has to be a setting in your UEFI setup menu or boot menu. – Byte Commander Aug 19 '17 at 16:36
  • Ah..cool..cheers. I a bit new to this. – Francisco Aug 19 '17 at 16:36
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  1. Depending on how you created the USB boot drive, it works in both [U]EFI and BIOS (alias CSM alias legacy) mode. If you clone the iso file to the USB drive, it will boot in both boot modes. In the original question I can see the iso9660 partition, which indicates a cloned system. And you set the boot mode in the UEFI/BIOS menu system, which is part of the computer.

  2. You may want to test if your live system is running in UEFI or BIOS mode. An installed system and a live system too is using the directory /sys/firmware/efi, so you can run the following command line,

    test -d /sys/firmware/efi && echo efi || echo bios
    
  3. Please notice that you will install a system, that works in the current boot mode,

    • If you install in UEFI mode, the installed system will work in UEFI mode
    • If you install in BIOS alias CSM alias legacy mode, the installed system will work in BIOS mode.
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  • That was helpful..cheers – Francisco Aug 19 '17 at 16:51
  • Let us know how it works for you to install Ubuntu Gnome. Good luck :-) – sudodus Aug 19 '17 at 16:53
  • Sure.. I'm still in the process of understanding the partition scheme, as it seems that I am suppose to create an ESP partition. (I am manually partitioning since I want to install windows later on..I am aware of the problems that might arise from this procedure as I've heard I'll have to do a boot repair) – Francisco Aug 19 '17 at 16:57
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    @sudodus Yeah, isn't it simpler to run grub-install rather than boot-repair? – wjandrea Aug 19 '17 at 17:07
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    Yes, @wjandrea, for you and me, but a new user might prefer a GUI tool. But I think the best option is to avoid reinstalling the bootloader ;-) – sudodus Aug 19 '17 at 17:19

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