Can't try ubuntu from usb stick

Support and Help
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Ubuntu Version:
25.04 arm, 25.10 arm and also ubuntu-concept/plucky-desktop-arm64+x1e.iso

Problem Description:
I have tried to install Ubuntu from a usb stick, but it fails right after selecting “Try and Install Ubuntu”. With 25.04 and 25.10, I get the message :

mount: mounting efivarfs on /sys/firmware/efi/efivars failed: Operation not supported

and then it reboots.

With ubuntu-concept, no message, it just reboots.

Relevant System Information:
Asus VivoBook 14 X1407QA-LY051W - Snapdragon X - X1-26-100 (X Plus)
Windows 11 already installed

Screenshots or Error Messages:
mount: mounting efivarfs on /sys/firmware/efi/efivars failed: Operation not supported
and then it reboots.

What I’ve Tried:
Tried different versions (25.04, 25.10, ubuntu-concept), tried making the usb stick with rufus and balena etchr on Win11 and with Startup disk creator on ubuntu.
Secure boot is disabled, and the Windows volume is decrypted.

I have found this issue on askubuntu, but no answer:
https://askubuntu.com/questions/1551387/unable-to-setup-ubuntu-25-04-on-arm-lenovo-thinkpad-t14s-g6-16-gb-snapdragon-x

Is there a way to install ubuntu on this laptop? Or maybe it is just not supported yet?

Thank you for your help.

2

There still are issues with Snapdragon.

Qualcomm Snapdragon

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3

Did you verify the ISO you downloaded, or use torrents to download the file?
A bad file will give a bad install experience etc

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4

Thank you for your answers, I have verified the iso following this tuto :

It was OK.
Maybe I should post directly on the ubuntu-concept thread.

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