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Description of problem: After yum upgrade from F15 to F16 and /sbin/grub-install system can't be booted after reboot. Was getting "ERROR 18". Fix was to Rescue boot to the system, remove grub, install grub2, run grub2-mkconfig and grub2-install Hardware: ThinkPad t410s (hd0) /dev/disk/by-id/ata-SAMSUNG_MMCRE28G8MXP-0VBL1_S0ENNEAZ609338
well, with a current f15 to f16 yum upgrade you won't be able to run grub-install, because grub is removed. you only have grub-efi and grub2. can you re-test with the affected system and see if it boots after upgrade if you *don't* run grub-install?
Adam, Thank you for addressing this issue -- I don't have anymore f15 around to try yum upgrade.
okay, let's close this as missing data then.