I have a very similar model T100TA-DK003H.

I dual boot it, I kept the windows OS.

Hi Benmec,
It is not that I eliminated Windows. Windows disappeared when I install Ubuntu 20.04.01

Do you remember where you found this?
It's possible you need to boot a WindowsPE and unlock it from within this running mini Windows.

There are some custome WinPE ISOs out there with a desktop and lots of Windows system tools to deal with Windows based issues. That's the road I'd be wandering down

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For all intensive purposes, you can just download Windows 10 from Microsoft and install it to USB if you can find the right software, I used to do that with Windows 8.1. Use it for 30 days possibly.

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"Windows disappeared when I install Ubuntu 20.04" Use Gparted/parted/disks to see what partitions exist.

Windows may still be there unless you erased it. It might be possible to fix the loader.

I think you have a 64 bit computer that has a goofy 32 bit uefi implementation.

Common scenarios are using the wrong install option which will overwrite windows. The other more common on newer computers is installing the 2 operating systems in different modes, UEFI/Legacy.

Thanks yancek, the only thing I have access now it the bios legacy and I think I cannot even put or install any information by the USB.
I have tried Easy Flash.
My Bios is set to USB Boot.
My security boot is disabled.
I have tried to boot with a USB a media creation for Windows.
The only think left, i think, is to put a EFI shell on a stick to see if it will boot it!

For all intents and purposes...

to boot to the USB.

insert your Live Ubuntu USB.
at turn on, press quickly the "esc" key as soon as the power light comes on (next to the camera).
you will get a text box with multiple options:

windows boot manager (if the efi boot manager still has the windows entry, mine does)
Ubuntu, if it has an efi boot manager entry.
UEFI: USB *something*. ..... choose this one to boot to the Live desktop.
enter setup.

otherwise
"enter setup": these are my settings:
(the BIOS is a UEFI only, no CSM or legacy options.)

under "advanced tab" is USB configuration set to USB controller select [XHCI]?
and Platform Trust Technology "fTPM" set to [Disabled]? this should get rid of the bitlocker issue.
under "security tab" is "secure boot menu", secure boot support set to [Disabled]?

save and exit; power off!
power up and press "esc" choose the USB option - you should be able to boot to the live desktop.
now you can use file manager to inspect any / all partitions and check to see if any windows files are there, or your new installed Ubuntu.

I dont know if Ubuntu supports 32bit EFI on the Live.iso, so you may have to download the 32 bit EFI boot file and install it manually.

edit: if no UEFI USB option is listed in the "esc" boot menu, the USB image has not been correctly created.

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That never worked for me on any Asus. The only Asus boot device menu hotkey I'm aware of is F8.

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I was using the Asus T100TA I have here to be absolutely sure all the steps

BTW, Mageia - I see in your distros list, works great on it.

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Hi Benmec,
I am getting somewhere, thanks to your price guide. Now what I have is on the UEFI screen after the ESC is:
Lost of line of info and:
Warn: An NTFS service is already loaded
3 lines of info and:
Fail Could not locate efi boot bootia32.efi: (14) not found
I don't know if Ubuntu is the best favor to install for me. If you have advices, please. I will do a research with a 32 bit, i thought my CP was a 64!
Thank you very much. At least I am going somewhere!

In the bios, what does the "save and exit" tab have under "boot override"?

As I dual boot, mine has:
Windows Boot Manager
mageia

I do know that all of the Mageia 8.isos boot and install without issue, so you could try any one of those.
As previously noted, I dual boot, so my outcome may be different to yours.
Just remember, they are not Ubuntu or Debian clones, so if you are familiar with Ubuntu / Debian, there will be differences.

Hi Benmec,
Under Boot override I have
-Windows Boot Manager
-USB Entry for Windows to Go
-UEFI: SanDisk
-Lauch EFI Shell from filesystem device
I did a research and even if I have a 32bit CP I can install a 64bit because they are compatible.