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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