On 06.12.2025 16:30 Uhr Henry Chang wrote:

> But it can be booted from another USB with Debian 12 installer. So I
> reinstalled the whole Debian 12 on the same USB hard drive. After I
> completed the installation and reboot the laptop, there is still NO
> bootable Debian shown.

Where did you install the EFI system partition for that OS?

Show lsblk from a running live system.

-- 
kind regards
Marco

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