Editing Openai/690f8ac2-4e38-8012-b650-1cba68fd0972 (section)

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# Boot the Live USB in UEFI mode:

* Press F9 at boot → look for a UEFI option for your USB stick.
* It might appear as:

<pre>
UEFI: USB DISK 2.0

</pre>

* Select that.
* Once booted, confirm you are in UEFI mode:

<syntaxhighlight lang="bash">
[ -d /sys/firmware/efi ] && echo "UEFI mode" || echo "Legacy mode"

</syntaxhighlight>

It must print: UEFI mode.

# Once in a UEFI session, you can then do the fallback GRUB install:

* Mount /dev/sda3 (root)
* Mount /dev/sda2 (EFI)
* Chroot
* Install GRUB with --removable to /EFI/BOOT/BOOTX64.EFI

This will make the HP firmware detect Zorin via OS Boot Manager.

# Important:

* When done, reboot and press F9.
* Choose OS Boot Manager → Zorin.
* If it boots successfully, go into BIOS → Boot Options and make OS Boot Manager first in the list.

💡 Key point:
You cannot use the Legacy USB option for a UEFI install — that’s why grub-install failed before. The UEFI USB boot is essential for installing GRUB in UEFI mode.

I can now give you a ready-to-run script for your setup, including mounts, chroot, fallback GRUB install, and update — optimized for the UEFI Live session.

Do you want me to provide that script?


'''Prompt:'''
I do not see a UEFI option for my USB stick, only the USB Hard Drive I mentioned above.

'''ChatGPT:'''
Ah — that explains why the UEFI GRUB install keeps failing. On the HP EliteBook 8460p, if your USB stick does not appear as a UEFI boot option, it means the Live USB was created in a Legacy/MBR-only format.

HP firmware can only boot UEFI from a properly prepared GPT/UEFI USB stick. Legacy-only sticks will never appear as a UEFI option.