Hi Samuel, I hit the F12 button then I got the menue: 1) USB HDD: Samsung SP...... -> the external disk with F21 on it 2) Windows Boot Manager ...... But also choosing USB HDD in this menue results in the same error message. In a Fedora Forum I found a thread describing the same problem for F20: https://ask.fedoraproject.org/en/question/39126/bootloader-has-not-verified-loaded-image/ The UEFI branch of this Acer Laptop has "Secure Boot" set to "standard", but I can not switch off Secure Boot, it seems to be blocked. I will ask the Acer support on Monday and then continue. Anyway I booted again the TC3 Live DVD in UEFI bios mode, installed YUM and reinstalled grub2-efi (in a terminal, su, yum reinstall grub2-efi) I got grub2-efi.x86_64 1:2.02-0.8.fc21 installed. Then run the installation to the external disk -> same bad result, booting not possible. Possibly I have to find a way to disable the Secure Boot. Kind Regards
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