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 Send spam to [email protected]

