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Grub does not boot after kernel upgrade (secure boot disabled)

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http://www.linuxquestions.org – Hi, after performing a kernel upgrade, grub2 does not boot into Fedora 19 any more. I had installed FC19 with secure boot disabled. When I try to enable secure boot again from the BIOS, I probably wasn't able to sign either grub2 or the (new) kernel properly. I am requested "Select an X509 certificate to enroll". I can in fact still boot Win8 (both with and without secure boot), and fortunately can still boot the kernel prior to the upgrade (without secure boot, of course). I immediately set installonly_limit=0 in /etc/yum.conf , in order to avoid future kernel upgrades to clean (HowTos)